(x^2 - 1) factors. This is a basic factoring procedure. Make sure you know it Solve it like this x^2 - a^2 = (x + a)(x - a)
so for x^2 - 1 you get (x + sqrt(1) ) (x - sqrt(1) = (x + 1)(x-1) x^2 - 1 = (x + 1)(x - 1)
(x - 1)(x + 1) =0 x - 1 =0 x = 1
x + 1 = 0 x = - 1
The two answers are x = 1 and x = - 1 You might want to try these. If you post the answers, I'll tell you how you did. Just make comments x^2 - 25 = 0 x^2 - 9 =0 x^2 - 36 = 0 x^2 - 49 = 0
