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$\int\left(3x+4\right)\left(3x+9\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral of (3x+4)(3x+9). Find the integral. Rewrite the expression \left(3x+4\right)\left(3x+9\right) inside the integral in factored form. The integral of a function times a constant (3) is equal to the constant times the integral of the function. Rewrite the integrand \left(3x+4\right)\left(x+3\right) in expanded form.