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The trinomial $81x^2-36x+4$ is a perfect square trinomial, because it's discriminant is equal to zero
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$\Delta=b^2-4ac=-36^2-4\left(81\right)\left(4\right) = 0$
Learn how to solve polynomial factorization problems step by step online. Factor the expression 81x^2-36x+4. The trinomial 81x^2-36x+4 is a perfect square trinomial, because it's discriminant is equal to zero. Using the perfect square trinomial formula. Factoring the perfect square trinomial.