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Rewrite the integrand $\left(9+x^2\right)^2$ in expanded form
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$\int\left(81+18x^2+x^{4}\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral int((9+x^2)^2)dx. Rewrite the integrand \left(9+x^2\right)^2 in expanded form. Expand the integral \int\left(81+18x^2+x^{4}\right)dx into 3 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int81dx results in: 81x. The integral \int18x^2dx results in: 6x^{3}.