Question

(x-7)^2=12

Answer 1

square it out giving:
x^2-14x+49=12
x^2-14x+37=0
Then use the quadratic formula.

Answer 2

Malevolence is right, but I think an even easier approach, since it's already factored for you, is to take the square root of both sides and then move the 7 over.

Answer 3

That would work too. Just don't forget the +/- ambiguity.