how do you complete this question of 0=x^2-4x+4

Question

0=x^2-4x+4 please email me and show me how to complete this problem.

Answer 1

you use the quadratic formula -b +/- and then underneath the root thing -b^2- 4ac  and then all over 2a and then plug in so  a=1 b=-4 c=4. So it would look like this: -(-4)+/- and then underneath the root thing -4^2 -4(1)(4) and all over 2(1). Then 4+/- and underneath the root thing 16 -16 and all over 2