SOLUTION: A number is 12 less than its square. Find all such numbers.

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Question 630078: A number is 12 less than its square. Find all such numbers.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x=x^2-12
0=x^2-x-12
find factors of -12 which add up to -1
-4 and 3
x^2-4x+3x-12=0
x*(x-4)+3*(x-4)=0
(x+3)*(x-4)=0
x=-3
x=4