Question

Solve:
x^2+8x-8=0

A. {-4, pos./neg. sq. root of 6}
B. {4, pos./neg. sq. root of 12}
C. {-4, 2 times pos./neg. sq. root of 12}
D. {-4, 2 times pos./neg. sq. root of 6}

Answer 1

@pooja195

Answer 2

@mathmate

Answer 3

are you learning how to complete a square?

\(x^2+8x-8 = 0\)
\( (x+4)^2-16-8 = 0\) ????

or to plug numbers into this (same thing) \( \frac{- b \pm \sqrt{b^2 - 4ac}}{2a}\) ??

or to draw curves?

Answer 4

it just says to solve it and I don't know how. it's probably completing the square.

Answer 5

ok!, well here you go:
https://www.mathsisfun.com/algebra/completing-square.html

suggest you have a crack at this and report back

good luck :p

Answer 6

@yayah2001
The answer choices are all wrong.
The way they are written, there are 3 roots, which is impossible for a quadratic equation.
You may want to check if there is a typo, perhaps the comma (,) should be a plus sign or something else.

Answer 7

I got the answer. thanks for the help!

Answer 8

the answer *is* in there :p

Answer 9

@IrishBoy123
I am not worried about the answer. The OP should understand that there is a difference between {-4, 2 times \(\pm\sqrt{6}\)} which implies 3 roots, and {-4+ 2 times \(\pm\sqrt{6}\)} which means there are two roots.
He may have chosen the right letter choice, but real life does not exist in multiple choices, sigh!

Answer 10

by 2 times I meant multiplication