3x^2 + 5x =8
Solve with the quadratic formula. I messed up somewhere in my solving... Steps would be great~!

Answers

Answer 1
Just plot the function and mark the points it crosses through.


X has two solutions = -8/3 & 1
Answer 2
quadratic formula

for ax^2+bx+c=0
x=[tex] \frac{-b+/- \sqrt{b^2-4ac} }{2a} [/tex]

first conver to ax^2+bx+c=0 form

3x^2+5x=8
minus 8 both sides
3x^2+5x-8=0
we can actually solve by factoring (x-1)(3x+8), but that's isn't the question

so

ax^2+bx+c=0
3x^2+5x-8=0
a=3
b=5
c=-8

x=[tex] \frac{-5+/- \sqrt{5^2-4(3)(-8)} }{2(3)} [/tex]
x=[tex] \frac{-5+/- \sqrt{25+96} }{6} [/tex]
x=[tex] \frac{-5+/- \sqrt{121} }{6} [/tex]
x=[tex] \frac{-5+/-11}{6} [/tex]
so
x=(-5-11)/6 or (-5+11)/6
simplify
(-5-11)/6=-16/6=-8/3
(-5+11)/6=6/6=1

x=-8/3 and 1


Related Questions

Convert to proper fraction or mixed number (do not reduce to lowest terms)
5.27 ...?

Answers

every decimal number is also a fraction. 5.27 can be written as 5.27/1. Now to convert it to a fraction we need to eliminate the decimal points.So we first multiple the numerator by 100, so that we get 527. If we multiply the numberator by 100 we need to multiply the denominator by 100 as well to keep the value of the fraction unchanged. So the resulting fraction we get is 527/100. Now this is an improper fraction where the numerator (527) is greater than the denominator (100) so these fractions get converted to mixed fractions, where one divides the numerator by the denominator. In this case 100 divides 527 fives times to give 500 and a remainder of 100.So the fraction becomes, 5 27/100
Final answer:

5.27 can be converted to a mixed number 5 27/100, where 5 is the whole number and 27/100 is the decimal part expressed as a fraction, without reducing to lowest terms.

Explanation:

To convert the decimal number 5.27 to a proper fraction or a mixed number, we first recognize that .27 is the decimal part of 5.27. We can write .27 as a fraction by considering it as 27 hundredths, which is 27/100. Therefore, we have the whole number 5 and the fraction 27/100. Combining these, we get the mixed number 5 27/100. Since we are instructed not to reduce to lowest terms, the mixed number remains as is.

slope -2 and passes through (1, 1)

Answers

In slope intercept form it's y=-2x+1

Use the linear approximation (1+x)^kapprox 1+kx to find an approximation for the function f(x) for values of x near zero.

a.) f(x)=(1-x)^(8) approx

b.) f(x)=-8/(1-x) = approx

c.) f(x)= 1/(sqrt(1+x)) = approx

d.) f(x)=sqrt(4+x^2) approx =

e.) f(x)=(6+3x)^(1/3) approx =

Answers

Final answer:

To approximate functions near zero using the linear approximation (1+x)^k ≈ 1 + kx, we find an approximation for each given function.

Explanation:

To approximate the function f(x) for values of x near zero using the linear approximation (1+x)^k ≈ 1 + kx, we need to find an approximation for each given function:

a.) f(x) = (1-x)^8 ≈ 1 - 8x

b.) f(x) = -8/(1-x) ≈ -8x

c.) f(x) = 1/(sqrt(1+x)) ≈ 1 - 0.5x

d.) f(x) = sqrt(4+x^2) ≈ 2 + x^2/4

e.) f(x) = (6+3x)^(1/3) ≈ 2 + x/3

What substitution should be used to rewrite 4x12 – 5x6 – 14 = 0 as a quadratic equation?
u = x2
u = x3
u = x6
u = x12

Answers

the answer is 

4x12 – 5x6 – 14 = 0
this equation is equivalent to 4(x^6)² – 5(x^6) – 14 = 0
so if u=x^6
we have 4(u)² – 5(u) – 14 = 0, and it is a quadratic equation

so the answer is u = x6 

Ted and Robin each gave a basket of green apples to their friend Lily. Ted’s basket contains 5 apples, each weighing ounces. Robin’s basket contains 6 apples, each weighing ounces. Whose basket is heavier and by how much?

Answers

Final answer:

Robin's basket is heavier than Ted's basket by 2 ounces.

Explanation:

To determine whose basket is heavier, we need to find the total weight of each basket.

Ted's basket contains 5 apples, each weighing 8 ounces. Therefore, the total weight of Ted's basket is 5 * 8 = 40 ounces.

Robin's basket contains 6 apples, each weighing 7 ounces. Therefore, the total weight of Robin's basket is 6 * 7 = 42 ounces.

Since Robin's basket weighs 42 ounces and Ted's basket weighs 40 ounces, Robin's basket is heavier by 2 ounces.

Match Term Definition


Line Segment A) a series of points that extend in two directions without end


Plane B) two lines that intersect at 90° angles


Perpendicular Lines C) lines that lie in the same plane and do not intersect


Line D) a flat surface that extends infinitely and has no thickness


Parallel Lines E) part of a line that has two endpoints

Answers

Answer:

Line segment: E

Plane: D

Perpendicular lines: B

Line: A

Parallel lines: C

Step-by-step explanation:

Final answer:

This middle school mathematics question asks for matches between geometric terms and their definitions. Line segments have two endpoints, planes extend infinitely without thickness, perpendicular lines intersect at 90 degrees, lines extend indefinitely in two directions, and parallel lines never intersect.

Explanation:

In the field of mathematics, particularly in geometry, we often deal with various foundational elements such as lines, line segments, planes, and the relationships between them. To understand these concepts, it is essential to know their definitions and how they relate to each other.

A line segment is best described as a part of a line that has two distinct endpoints. This means a line segment is contained and does not extend infinitely in any direction. An example of this is the edge of a ruler, which begins and ends at specific points. The correct match for a line segment in the provided list is E) part of a line that has two endpoints.

A plane in geometry is a flat, two-dimensional surface that extends infinitely in all directions. It's similar to a vast sheet of paper with no edges. It is defined by at least three noncollinear points and is often represented in drawings as a four-sided figure, but it continues without end. The correct definition for a plane is D) a flat surface that extends infinitely and has no thickness.

Perpendicular lines are two lines that intersect at an angle of 90 degrees. The point where they cross forms right angles, and the two lines are always at the same distance from each other at this point. The definition of perpendicular lines is B) two lines that intersect at 90° angles.

Regarding a line, it is an undefined term in geometry that represents a straight path that extends infinitely in both directions with no thickness. It is comprised of an infinite number of points. A simple description of a line is A) a series of points that extend in two directions without end.

Lastly, parallel lines are lines in the same plane that do not intersect, no matter how far they are extended on either side. This is because they are always the same distance apart, maintaining a consistent separation across their entire length. The correct match for parallel lines is C) lines that lie in the same plane and do not intersect.

Factor out the greatest common factor
-5x^2 - 5x^3 - 15x^4

Answers

Our answer is [tex] -5x^{2} (3x^{2} +x+1) [/tex]

Our greatest common factor, or GCF, is [tex] -5x^{2} [/tex], so when we factor is out, our divide each term by [tex] -5x^{2} [/tex], we get our answer. To check this, we can multiply the [tex] -5x^{2} [/tex] back across the parenthesis and see if we get the same result as our initial question.

Hope this helped! :))

X^2-5=-4x^2 3x in standard form

Answers

X^3 +X^2 -5 =0
this is the answer i guess if -4X^2 times 3X

What fraction is.85 of an inch?

Answers

17/20 of an inch 85/100 simplifies to 17/20
Step 1: 0.85 = 85/100 
Step 2: Simplify 85/100 = 17/20 

hope this helps you

What is the total interest on a ten-year. 6.1% loan with a principal of $32,000?

Answers

Final answer:

The total interest on a ten-year, 6.1% loan with a principal of $32,000 is $19,520.

Explanation:

To find the total interest, we need to use the formula:

Interest = Principal × Rate × Time

Given that the principal is $32,000, the interest rate is 6.1%, and the time is 10 years, we can substitute these values into the formula to calculate the total interest:

Principal: $32,000

Rate: 6.1%

Time: 10 years

Interest = $32,000 × 0.061 × 10 = $19,520

Therefore, the total interest on a ten-year, 6.1% loan with a principal of $32,000 is $19,520.

What is greater four liters or one gallon

Answers

Here, as we know 1 L = 0.26 gal
so, 4 L = 1.05 gal, which is greater than 1 gal

So, 4 L will be Greater!

Hope this helps!

Answer:

One Gallon

Step-by-step explanation:

One Imperial gallon is 4.54 litres so in that case the gallon is greater but one US gallon is only 3.79 litres so in that case the litres is bigger. ... or 1 gallon =1/. 22 =4.545 liters. so one gallon is greater than 4 liters.

The wheeler's bill at a restaurant is $63.00 how much money should mr. wheeler leaves as a tip if he plans to tip 15%?

Answers

$9.45 as a tip
63/100x15=9.45
He should tip $9.45 .
when you want to figure out a tip, you take your total bill and multiply it by the percentage you would like to tip them and put a decimal in front of the percentage. So the problem would look like 63x .15 =9.45

consider the function f(x)=2x^2-8x+5.
a)express f(x) in the form of a(x-p)^2+q,where a,p,q are Z?
b)find the minimum value of f(x)? ...?

Answers

This is called completing the square. 


f(x) = 2x^2 - 8x + 5 

f(x) = 2(x^2 - 4x) + 5 

f(x) = 2[(x-2)^2 - 4] + 5 

f(x) = 2(x-2)^2 - 8 + 5 

f(x) = 2(x-2)^2 - 3 


f(x) is at a minimum when (x-2) = 0, therefore x = 2 

f(2) = 2(2-2)^2 - 3 

f(2) = -3


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Heather writes the equations below to represent two lines drawn on the coordinate plane.

–6x + 18y = 0
4x – 12y = 20
After applying the linear combination method, Heather arrived at the equation 0 = 60. What conclusion can be drawn about the system of equations?

The equation has no solution; therefore, the system of equations has no solution.
The equation has a solution at (0, 60); therefore, the system of equations has a solution at (0, 60).
The equation has infinite solutions; therefore, the system of equation as infinite solutions.
The equation has a solution at (0, 0); therefore, the system of equations has a solution at (0, 0).

Answers

According to the represented datum, the correct answer is : equation has no solution; therefore, the system of equations has no solution because it is imposible  when girl should rich  0 = 60. 
I am pretty sure it helps! Do hope you will agree with me.

Answer:

its A if you are taking the unit test

Step-by-step explanation:

How do you write 6 19/25 as a decimal?

Answers

6 19/25 as decimal is 4.56

[tex]\huge\textsf{Hey there!}[/tex]


[tex]\mathsf{6 \dfrac{19}{25}}[/tex]

[tex]\mathsf{= \dfrac{6\times25 + 19}{25}}[/tex]

[tex]\mathsf{= \dfrac{150 + 19}{25}}[/tex]

[tex]\mathsf{= \dfrac{169}{25}}[/tex]

[tex]\mathsf{= 169 \div 25}[/tex]

[tex]\mathsf{= 6.76}[/tex]


[tex]\huge\textsf{Therefore, your answer should be: \boxed{\mathsf{6.76}}}\huge\checkmark[/tex]


[tex]\huge\textsf{Good luck on your assignment \& enjoy your day!}[/tex]


~[tex]\frak{Amphitrite1040:)}[/tex]

Multiply.
Express your answer as a simple fraction or improper fraction.

7 · 3/4 = n

Answers

n=21 over 4 You solve for n by simplifying both sides of the equation, then isolating the variable.
7*3/4 = 5 1/4. 5 1/4 as an improper fraction is 21/4. To find the improper version, Multiply 5*4 and you get 20. Add 20+1 and you get 21. Keep the Denominator (or the bottom number) the same, and you have 21/4.

is y=-3x-8 perpendicular, parallel, or neither?

Answers

y=-3x+8 is not parallel nor perpendicular to y=3x+8.
Thus, it is neither.
If one line is parallel to another line, then they will both have the same slope (the coefficient next to the x).
For instance, y=5x+8 is parallel to y=5x-4.
If one line is perpendicular to another line, then the slopes must be  negative reciprocals of one another (reciprocals multiply together and yield one, like 1/3 and 3.)
A parallel line to y=-3x-8 would be y=-3x
A perpendicular line to y=-3x-8 would be y=1/3x
Since the line we are comparing y=-3x-8 to, which is y=3x+8, meets neither of the constraints for being parallel or perpendicular, the correct answer is neither.

solve for x. round your answer to two decimal places. show your work for full credit. a right triangle is shown with the hypotenuse labeled x. one angle has a measure of thirty degrees, and the opposite leg has a length of ten.

Answers

I hope this helps you

The value of x is 20 when right triangle is with the hypotenuse labeled x , one angle has a measure of thirty degrees, and the opposite leg has a length of ten.

What is Trigonometry?

Trigonometry is a branch of mathematics that studies relationships between side lengths and angles of triangles.

Right ∆ with Hypotenuse is x, Opposite is 10

Reference angle  = 30°.

We need to find the value of x

Since we are given a reference angle with opposite length, and we are to find the hypotenuse length, x, apply the following trigonometric ratios formula:

sin(theta)=opposite side/hypotenuse

Plug in the values into the equation

sin 30 = 10/x

1/2=10/x

Apply cross multiplication

x=20

Hence, the value of x is 20 when right triangle is with the hypotenuse labeled x , one angle has a measure of thirty degrees, and the opposite leg has a length of ten.

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Paul has 2/3 as many postcards as shawn . the number of postcards shawn has is 3/5 of the number of postcards tim has. if the three boys have 280 postcards altogether,how many more postcards does tim have than paul ?

Answers

p = ( 2 / 3 )s;
s = ( 3 / 5 )t ;
p + s + t = 280 ;
Then, p =( 2 / 3 )( 3 / 5 )t ;
p = ( 2 / 5 )t;
We solve the equation : ( 2 / 5 )t + ( 3 / 5 )t + t = 280 ;
( 2 / 5 )t + ( 3 / 5 )t + ( 5 / 5 )t = ( 1400 / 5 )t;
10t = 1400 ;
t = 1400 ÷ 10 ;
t = 140 postcards has Tim;
p = ( 2 / 5 ) × 140 = 56 postcards has Paul;
s = ( 3 / 5 ) × 140 = 84 postcards has Shawn ;

Find the value of cos θ for the angle shown

Answers

7/4 sqrt(33)/4 4/7 sqrt(33)/7 --> 4/7
cos θ = cos (360 - θ) = 4/sqrt(4^2 + (-√33)^2) = 4/sqrt(16 + 33) = 4/sqrt(49) = 4/7

is 48/72 and 6/9 Proportional or Nonproportional

Answers

I hope this helps you

The fractions (48/72) and (6/9) are proportional as, (8/8)(6/9) is equal to (48/72).

What are ratio and proportion?

In its most basic form, a ratio is a comparison between two comparable quantities.

There are two types of proportions One is the direct proportion, whereby increasing one number by a constant k also increases the other quantity by the same constant k, and vice versa.

If one quantity is increased by a constant k, the other will decrease by the same constant k in the case of inverse proportion, and vice versa.

Given, A fraction 48/72.

Now, If we simplify the fraction by factoring out some common terms we'll have,

24/36.

= 12/18.

= 6/9.

So, They are proportional.

learn more about proportion here :

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answer that for me please i am very confused

Answers

I think that the answer might be C as well

true or false Volume can be measured in liters or cubic meters.

Answers

The correct answer of the given statement above would be TRUE. It is true that volume can be measured in liters or cubic meters. Liters and cubic meters are units used to measure volume usually related to liquid volume. Hope this answers your question. 

The product of two numbers is 48, and one of the numbers is 12. find the other number. which equation can be used to solve this problem?

Answers

12×4=48 so the other number is 4

Solve for the equation. u + 3.5 = 5

Answers

Subtract 3.5 from each side of the equal sign. u = 1.5

You have $6,500 to deposit. If you deposit the money in a savings account at your local bank, you will earn 1.45% annual interest and will be able to make ATM withdrawals at your bank's ATMs. If you deposit the money in an online savings account, you will earn 2.25% interest, but you will be charged $4 every time you make an ATM withdrawal. Assuming that your ATM withdrawals do not reduce the amount of interest you earn, how many ATM withdrawals must you make in a year for the local savings account to be a better deal than the online savings account?
a.
5
b.
12
c.
14
d.
10

Answers

The amount earned from the local account must be greater than that of the online account.
Amount from local account = 6,500(1.0145)ⁿ
Amount from online account = 6,500(1.0225)ⁿ - 4x
Where n is the number of years and x is the number of ATM withdrawals.

6,500(1.0145)ⁿ > 6,500(1.0225)ⁿ - 4x
4x > 6,500[(1.0225)ⁿ - (1.0145)ⁿ]; n = 1
x > 13
The number of withdrawals must exceed 13.

The answer is C.

Answer:

C. 14

Step-by-step explanation:

I just answered it correct

Carol sells candles and Yankee Candle. She earns $8.50 per hour plus 6% commission on sales. Last week Carol worked 40 hours. What was Carol’s weekly gross salary if her total sales were $250? *

$590.51
$352.16
$355.00
$340.00

Answers

352.16 this should indefinite like this should be the ace in the game.

Answer:$352.16

Im in a rush so cant add explaination

Question 4 Rachel, Greg, and Trey sent a total of 71 text messages over their cell phones during the weekend. Trey sent 3 times as many messages as Greg. Greg sent 9 more messages than Rachel. How many messages did they each send?

Answers

Rachel sent 7 Greg sent 16 and Trey sent 48 ... 7+9=16
16x3=48
7+16=23
23+48=71
7+16+48=71

What is the simplified form of x plus 1 over x squared plus x minus 6 divided by x squared plus 5x plus 4 over x minus 2

Answers

[tex] \frac{x+1}{ x^{2} +x-6} / \frac{ x^{2} +5x+4}{x-2} \\ \frac{x+1}{(x+3)(x-2)} / \frac{x-2}{(x+1)(x+4)} \\ \frac{x+1}{(x+3)(x-2)}* \frac{(x+1)(x+4)}{x-2} \\ \frac{1}{(x+3)(x+4)} [/tex]

Answer: The simplified form will be

[tex]\frac{1}{(x+3)(x+4)}[/tex]

Step-by-step explanation:

Since we have given that

[tex]\frac{x+1}{x^2+x-6}\div \frac{x^2+5x+4}{x-2}[/tex]

We need to simplify the above expression, we get that

[tex]\frac{x+1}{x^2+x-6}\div \frac{x^2+5x+4}{x-2}\\\\=\frac{x+1}{x^2+x-6}\times \frac{x-2}{x^2+5x+4}\\[/tex]

Now, we first factorize the quadratic equation:

[tex]x^2+x-6\\\\=x^2+3x-2x-6\\\\=x(x+3)-2(x-3)\\\\=(x+3)(x-2)[/tex]

Similarly,

[tex]x^2+5x+4\\\\=x^2+4x+x+4\\\\=x(x+4)+1(x+4)\\\\=(x+4)(x+1)[/tex]

So, it will become

[tex]\frac{x+1}{x^2+x-6}\times \frac{x-2}{x^2+5x+4}\\\\=\frac{x+1}{(x+3)(x-2)}\times \frac{x-2}{(x+4)(x+1)}\\\\=\frac{1}{(x+3)(x+4)}[/tex]

Hence, the simplified form will be

[tex]\frac{1}{(x+3)(x+4)}[/tex]

lim x->1 (x^n-1)/(x^m-1) =?

Answers

please read the attached file
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