Question

Please help. i tried them all i cant figure it out. 2x^2-12=116
A i got 4
B i got 52
C i got 244
D i got 1012

Answer 1

2x^2 = 116 + 12
2x^2 = 128
x^2 = 128/2
x^2 = 64

Answer 2

Now you need to find the 2 square roots of 64 and thats your answer

Answer 3

b

Answer 4

??
does 4 * 4 = 64??

Answer 5

oh 8*8

Answer 6

so 8 is one root
what is the other?

Answer 7

-8

Answer 8

yes

Answer 9

thanks :))

Answer 10

yw

Answer 11

Another way to do it (a little bit harder than what @welshfella did):
Quadratics
\(\large 2x^2 - 12 = 116\)
\(2x^2 - 128 = 0\)
\(2(x^2 - 64) = 0\)
\(2(x-8)(x+8) = 0\)
Solve for what \(x\) is so that it can make the equation be 0 (or find the roots)
\(2x - 16 = 0\)
\(x = 8\)

\(x + 8 = 0\)
\(x = -8\)

Two roots (or x-values): 8, -8