anonymous
  • anonymous
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}
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
IrishBoy123
  • IrishBoy123
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?

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anonymous
  • anonymous
it just says to solve it and I don't know how. it's probably completing the square.
IrishBoy123
  • IrishBoy123
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
mathmate
  • mathmate
@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.
anonymous
  • anonymous
I got the answer. thanks for the help!
IrishBoy123
  • IrishBoy123
the answer *is* in there :p
mathmate
  • mathmate
@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!
anonymous
  • anonymous
by 2 times I meant multiplication
triciaal
  • triciaal
|dw:1433125475102:dw|
mathmate
  • mathmate
@yayah2001 You may not have noticed it, it's between the comma and the + sign that I was referring to.
anonymous
  • anonymous
thanks for the help, @mathmate, I already have the answer. but, thanks for helping.

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