Question 289247
3^2-x^2=8

9 - x^2  = 8


x^2 = 9 - 8
x^2 = 1
x^2 - 1 = 0
(x-1)*(x+1) = 0

x-1 = 0 or
x+1 = 0

So x = 1 or x = -1