Question

Solve by factoring
x^2-x-90=0

Answer 1

-10 and 9

Answer 2

(x-10)(x+9)

Answer 3

set both equal to 0 and solve for x

x = 10 and -9

Answer 4

So, you're looking for factors of -90 that add up to -1.
If the sum of two numbers is negative, then the larger one would be negative.

Try listing the factors of -90 and adding them together. Then you may rewrite the equation as
(x - a)(x - b) = 0
you can then do
x-a = 0, x-b = 0 and solve for the x's

Answer 5

Does that help? Rather you should be practicing how to get to that...it gets easier