Question

When solving x2 – 4x = –7 by completing the square what value is added to both sides of the equation?

Answer 1

7

Answer 2

+7

Answer 3

(b/2)^2
b = -4
-4/2 = -2
-2^2 = 4
4

Answer 4

pk51 got it. You don't add 7 to both sides to complete the square, you divide b by 2 then square it, then add that result to both sides.