## Final Answer

## Step-by-step Solution

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The trinomial $121+198x^6+81x^{12}$ is a perfect square trinomial, because it's discriminant is equal to zero

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$\Delta=b^2-4ac=198^2-4\left(81\right)\left(121\right) = 0$

Learn how to solve factorization problems step by step online. Factor the expression 121+198x^6+81x^12. The trinomial 121+198x^6+81x^{12} is a perfect square trinomial, because it's discriminant is equal to zero. Using the perfect square trinomial formula. Factoring the perfect square trinomial.