I have been learning about simplifing expressions. However I am confused what to do when there is more than one item inside the brackets with an Exponent?
I was given the puzzle (x-25)^2 = X^2 -25
I can add 25 to each side as the first step, but I am not sure what to do next.
I think I get X^2 -625 + 25 = X^2
I am not sure if it should be +625 or -625... I think I am just missing something basic, but I can not fathom it out.