Incorrect
(x + 2)2 = 8
Move the constant term to the right:
-4 + 4x + x2 = 0
-4 + 4x + 4 + x2 = 0 + 4
Reorder and combine:
-4 + 4 + 4x + x2 = 0 + 4
0 + 4x + x2 = 0 + 4
4x + x2 = 0 + 4
4x + x2 = 4
The x term is 4x. Take half its coefficient 2. Square it and add 4 to both sides.
4x + 4 + x2 = 4 + 4
Reorder and combine the terms:
4 + 4x + x2 = 4 + 4
4 + 4x + x2 = 8
Factor a perfect square:
(x + 2)2 = 8
