Answer:
(x + 6)² - 36
Explanation:
given
x² + 12x
using the method of completing the square
add/subtract ( half the coefficient of the x- term)² to x² + 12x
= x² + 2(6)x + 36 - 36
= (x + 6)² - 36 ← in the form (x + a)² + b
with a = 6 and b = - 36
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