SOLUTION: I just can not remember how to set this problem up.

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Question 148681:
I just can not remember how to set this problem up.

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
A number is 20 less that its square. Find all such numbers.
.
Let x = a number(s)
.
x = x^2 - 20
0 = x^2 -x - 20
Factoring we get:
0 = (x-5)(x+4)
.
Solution: x = {5, -4}