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$\int\left(\left(a+9\right)^2-\left(a-9\right)^2\right)da$
Learn how to solve problems step by step online. Find the integral of (a+9)^2-(a-9)^2. Find the integral. Expand the integral \int\left(\left(a+9\right)^2-\left(a-9\right)^2\right)da into 2 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int\left(a+9\right)^2da results in: \frac{\left(a+9\right)^{3}}{3}. The integral \int-\left(a-9\right)^2da results in: \frac{-\left(a-9\right)^{3}}{3}.