Question

Factor x2 - x - 90 = 0

Answer 1

Any ideas?

Answer 2

put 90 on the other side????????

Answer 3

Hint: since -90 is negative what two numbers multiply to give -90 and add to give -1?

$$x^2-x-90=(x+r)(x-s)$$

Answer 4

10 and 9

Answer 5

You got it :-D

Answer 6

(x + 9)(x - 10)

Answer 7

thank you