Which equation is equivalent to x^2 + x = 12?
a) (x - 4)(x+3)=0
b) (x+4)(x-3)=0
c) (x+12)(x+1)=0
d) (x-12)(x-1) = 0

Question

Which equation is equivalent to x^2 + x = 12?
a) (x - 4)(x+3)=0
b) (x+4)(x-3)=0
c) (x+12)(x+1)=0
d) (x-12)(x-1) = 0

anonymous · Answer

B, would you like me to explain how i got it?

icalibear · Answer

Yes, that was my first answer and I broke it down into
x^2 - 12 = 0
x^2 = (x  )(x  ) = 0
4(-3) = -12
(x + 4)(x - 3) = 0

But that may be incorrect so please explain

anonymous · Answer

What i do first is that I look at the middle number $$x ^{2}+ x -12= 0$$, you have to make the equation equal 0. the middle number is X. 
1.  you would look at your answers. 
2. you add the (x+ 4)(X-3)  4+3= 1
3.than you 4 X -3 = -12 that is when the equation is what i did on top

anonymous · Answer

and for 2. it would be 4x+3x= X

icalibear · Answer

Okay. But why couldnt it just as easily be A, if -3(4) and (-4)3 are both -12?

anonymous · Answer

-4x +3 = |dw:1391664175278:dw|