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$\int\left(3x\left(x-3\right)-4x\right)dx$
Learn how to solve integral calculus problems step by step online. Simplify the expression x(x+-7)=3x(x-3)-4x. Find the integral. Rewrite the expression 3x\left(x-3\right)-4x inside the integral in factored form. We can solve the integral \int x\left(-13+3x\right)dx by applying integration by parts method to calculate the integral of the product of two functions, using the following formula. First, identify u and calculate du.