Need help for step by step problem-conditional and identity

[cmarva]

I know that it is an identity proble but I just need to know the step for step for solving the problem

X^2 - 8x+5 = (x -4) ^2 - 11

 

[skeeter]

expand the right side and collect like terms ...

(x - 4)² - 11 =

x² - 8x + 16 - 11 = ?