Factor (x^2+12x+36)

$(x^{2} + 12 x + 36)$

Remove parentheses.

$x^{2} + 12 x + 36$

Factor using the perfect square rule.

Rewrite $36$ as $6^{2}$ .

$x^{2} + 12 x + 6^{2}$

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$12 x = 2 \cdot x \cdot 6$

Rewrite the polynomial.

$x^{2} + 2 \cdot x \cdot 6 + 6^{2}$

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 6$ .

${(x + 6)}^{2}$