X(x+2)-13=(x-3)*(x+3)
X^2 + 2x - 13 = x^2 - 9 x^2 - x^2 + 2x = - 9 + 13 2x = 4 x = 2
X^2+2x-13=x^2-9 x^2-x^2+2x=-9+13 2x=4 x=2