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3 years ago

Find the value of this expression if x = 4 x^2 -8

Mathematics

1 answer:

antiseptic1488 [7]3 years ago

3 0

Let's solve your equation step-by-step.

x=4x2−8

Step 1: Subtract 4x^2-8 from both sides.

x−(4x2−8)=4x2−8−(4x2−8)

−4x2+x+8=0

For this equation: a=-4, b=1, c=8

−4x2+1x+8=0

Step 2: Use quadratic formula with a=-4, b=1, c=8.

x=−b±√b2−4ac2a

x=−(1)±√(1)2−4(−4)(8)2(−4)

x=−1±√129−8

x=18+−18√129 or x=18+18√129

Answer:

x=18+−18√129 or x=18+18√129

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List the following elements in proper set notation. Place the elements in numerical order within the set. 0, 1, 123, 4, 34

forsale [732]

Answer:

{0, 1, 4, 34, 123}

Step-by-step explanation:

{0, 1, 4, 34, 123}

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2 years ago

On the parallel line, find the ordered pair where X = 2??? PLEASE HELP

kozerog [31]

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2 years ago

I need a equation for my parabola! I tried so many times and got it WroNg-

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Answer:

Step-by-step explanation:

Not QUITE a parabola . but up until y = 4 it is close

Vertex = (-7-10)

Vertex form of parabola

y = a ( x+7)^2 -10 find a integer-coordinat point to calculate 'a'

I'll use -18,0

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5 0

1 year ago

A triangle has sides of lengths 8, 15, and 17. Is it a right triangle? Explain.

8_murik_8 [283]

Answer:

yes it does

17 is the longest side.

Iff Iff 17%5E2+=+8%5E2+%2B+15%5E2 it's a right triangle. it's a right triangle.

Ps "iff" means if and only if

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2 years ago

Solve the following system of equations. 2x+y=3 I= 2y - 1 x= y=

marin [14]

Note: I am assuming your second equation is:

x = 2y - 1

Answer:

The solution to the system of equations is:

x = 1

y = 1

Step-by-step explanation:

Given the system of equations

2x+y=3

x = 2y - 1

solving the system of equations using the elimination method

$\begin{bmatrix}2x+y=3\\ x=2y-1\end{bmatrix}$

Arrange equation variables for elimination

$\begin{bmatrix}2x+y=3\\ x-2y=-1\end{bmatrix}$

Multiply x-2y=-1 by2: 2x-4y=-2

$\begin{bmatrix}2x+y=3\\ 2x-4y=-2\end{bmatrix}$

subtracting the equations

$2x-4y=-2$

$-$

$\underline{2x+y=3}$

$-5y=-5$

now solve -5y = -5 for y

$-5y=-5$

Divide both sides by -5

$\frac{-5y}{-5}=\frac{-5}{-5}$

Simplify

$y=1$

For 2x+y=3 plug in y=1

$2x+1=3$

subtract 1 from both sides

$2x+1-1=3-1$

Simplify

$2x=2$

Divide both sides by 2

$\frac{2x}{2}=\frac{2}{2}$

Simplify

$x=1$

Therefore, the solution to the system of equations is:

x = 1

y = 1

8 0

2 years ago