Question 259932
x^2-8x=5
take 1/2 of the coefficient of x
8/2=4 and square it
4^2=16
add 16 to complete the square
x^2-8x+16=21
(x-4)^2=21
|x-4|=+\-21
x-4=21
x=25
x-4=-21
x=-17
x=25