Question 40303
From x^2 - 8x = 10, you are right if you have
x^2 - 8x + 16 = 10 + 16
x^2 - 8x + 16 = 26
(x - 4)^2 = 26
Now take the square root of both sides and solve for x, giving you
x - 4 = ± sqrt(26)
x = 4 ± sqrt(26)
and we're done...