How do you solve quadratics by 'completing the square'?

Once you have completed the square you have an equation in the form (x-a)^2 = b

You can solve for x by taking the square root of both sides* to get x-a = sqroot(b) or x-a = -sqroot(b)

Then rearrange by adding a to both sides to get two possible values for x.

*remember to use both the positive and the negative square root so that you still get two values of x