## Final Answer

## Step-by-step Solution

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The integral of a function times a constant ($3$) is equal to the constant times the integral of the function

Learn how to solve integrals of exponential functions problems step by step online.

$3\int e^x\cdot xdx$

Learn how to solve integrals of exponential functions problems step by step online. Find the integral int(3e^xx)dx. The integral of a function times a constant (3) is equal to the constant times the integral of the function. We can solve the integral \int e^x\cdot xdx 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. Now, identify dv and calculate v.