Solution: *This is a sneaky one! Do NOT start by removing the parentheses. Look at the pattern, instead.*
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Does this fit the pattern of a perfect square trinomial?
Yes.
Both (*m + n*)^{2} and 36 are perfect squares, and 12(*m + n*) is twice the product of (*m + n*) and 6.
Since the middle term is positive, the pattern is (*a + b*)^{2} =* **a*^{2}* + *2*ab + b*^{2}.
Let *a = *(*m + n*) and *b* = 6.
Answer: ((m + n) + 6)^{2 } or (m + n + 6)^{2} |