Question

Solve. x2 + 15x = –56

Answer 1

x = –8 and x = 7

x = –8 and x = –7

x = 8 and x = 7

x = 8 and x = –7

Answer 2

Quadratic formula.

Answer 3

Trial and error checking.

Answer 4

don't need it, just factor.

Answer 5

I prefer,
\[x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\]

Cerezas, you sure this can factor?

Answer 6

Actually, nevermind. Yes, it can.

Answer 7

x=-8 and x=-7

Answer 8

\[x ^{2}+15x+56 =0\]
so (x+7)(x+8) = 0
so x = -7, -8

Answer 9

x^2 + 15x + 56 = 0
Find factors of 56 that add up to 15.
(x + 8)(x + 7) = 0
x = -7, -8

Answer 10

I don't mean to be rude.. but we're supposed to help, not give out answers.

"Give Help, Not Answers
I will encourage and guide those needing help, and not just give them an answer"

http://openstudy.com/code-of-conduct

Answer 11

That is helpful I'm figuring it out stilll...

Answer 12

@Limitless it's factoring. there's only so much you can do.

Answer 13

Exactly

Answer 14

@cerezas, I agree. But you could have explained the method and let Katie try it for herself. Or you could've recommended a method. There were several different ways. I think you should have at least let her try and see where her mistakes were so that you could have corrected them.

Answer 15

@Limitless i did. factoring. it's the first thing to try.

Answer 16

Yes, but you gave the entire answer... At no point did Katie have to work for herself. (Of course, there is the possibility she had tried this previously. If so, she should've included her work.)

Answer 17

...or, she can do it herself, using my work as an example.
can we take this off her question? we're giving everyone a ton of notifications.

Answer 18

I just wanted people to know what the rules were. That is all. I personally disagree with people who post just answers. But everyone is entitled to their opinion and I respect that. Thank you for respecting mine.

Answer 19

sure :)