To complete the square
x² + 12x =0
Find the c value with (b/2)²
(12/2)² =36
add 36 in both sides
x² + 12x +36 = 36
a² + 2ab + b² = (a+b)²
Then find the square
(a+b)² = (x + 6)²
(x + 6)² = 36
The answer is a
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