Question

Solve the equation.

8x2 – 4 = 28

A.
2, –2

B.
4, –4

C.
8, –8

D.
16, –16

Answer 1

@Hero

Answer 2

1. Add four to both sides
2. Divide both sides by 8
3. Square root both sides
Don't forget to include the \(\pm\) in front of square root on the right sides.

Answer 3

I lost you at 3.............

Answer 4

You know what a square root is....\(\sqrt{\space\space\space}\)
Put x^2 and 16 under it

Answer 5

And don't forget the \(\pm\) symbol

Answer 6

Let me post the steps. I don't want to confuse you

Answer 7

Ok but what about the multiple choice it doesnt show an equation?

Answer 8

\(8x^2 - 4 = 28\)

Add four to both sides:
\(8x^2 = 32\)

Divide both sides by 8:
\(x^2 = 16\)

Square root both sides:
\(x = \pm\sqrt{16}\)

\(x = \pm 4\)

Answer 9

Its b

Answer 10

ok I get the formula now thanks @Hero

Answer 11

Its A.