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$\int\left(x^3+9x^2+18x\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral of x^3+9x^218x. Find the integral. Expand the integral \int\left(x^3+9x^2+18x\right)dx into 3 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int x^3dx results in: \frac{x^{4}}{4}. The integral \int9x^2dx results in: 3x^{3}.