Question

Factor x2 - x - 90 = 0

Answer 1

x^2 - x - 90 = 0

(x - 10)(x + 9) = 0

So, x = 10, x = -9

Answer 2

wouldnt it be -10?

Answer 3

and +9

Answer 4

You would stop at (x-10)(x+9) if they are just looking for the factors of x^2 - x -90

Answer 5

The solutions to the equation that madibear gave are correct, though, because of the zero product property--if you plug in 10 for x you get:

(10 - 10)(10 + 9)=0

(0)(10+9)=0

and anything multiplied by zero = 0, so:

0 = 0

Answer 6

The same applies for -9, because (x + 9) becomes 0