Express x^2-8x+5 in the form (x-a)^2-b where a and b are integers
x^2 - 8x + 5 = 0
x^2 - 8x + (8/2)^2 = (8/2)^2 -5
(x - 4)^2 = 16 - 5
(x - 4)^2 = 11
(x - a)^2 - b = (x - 4)^2 -11
