Answer:
(x+6)(x+6)
Explanation:
(x + 6)²
This is a perfect square of the form
(x + a)² = x² + 2ax + a²
here a² = 36 ⇒ a = 6 and 2ax = 2 × 6x = 12x
Hence
x² + 12x + 36 = (x + 6)²
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