Question 148729
x^2 - 2x - 13 = 0

x^2 - 2x =13

4x^2-8x=52

4x^2-8x+4=56
(2x-2)^2=56
2x-2=sqrt(56) or 2x-2=-sqrt(56)
x=(sqrt(56)+2)/2 or x=(-sqrt(56)+2)/2