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The trinomial $m^2+4mn+4n^2$ is a perfect square trinomial, because it's discriminant is equal to zero
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$\Delta=b^2-4ac=4^2-4\left(1\right)\left(4\right) = 0$
Learn how to solve polynomial factorization problems step by step online. Factor by completing the square m^2+4mn4n^2. The trinomial m^2+4mn+4n^2 is a perfect square trinomial, because it's discriminant is equal to zero. Using the perfect square trinomial formula. Factoring the perfect square trinomial.