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$\int\left(9x-4\right)\left(9x+4\right)dx$
Learn how to solve problems step by step online. Find the integral of (9x-4)(9x+4). Find the integral. Rewrite the integrand \left(9x-4\right)\left(9x+4\right) in expanded form. Expand the integral \int\left(81x^2-16\right)dx into 2 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int81x^2dx results in: 27x^{3}.