Learn how to solve problems step by step online. Solve the integral of logarithmic functions int(log(x+1))dx. We can solve the integral \int\log \left(x+1\right)dx by applying integration by substitution method (also called U-Substitution). First, we must identify a section within the integral with a new variable (let's call it u), which when substituted makes the integral easier. We see that x+1 it's a good candidate for substitution. Let's define a variable u and assign it to the choosen part. Now, in order to rewrite dx in terms of du, we need to find the derivative of u. We need to calculate du, we can do that by finding the derivative of the equation above. Substituting u and dx in the integral and simplify. Apply the formula: \int\log_{b}\left(x\right)dx=x\log_{b}\left(x\right)-\frac{x}{\ln\left(b\right)}+C, where b=10 and x=u.

Solve the integral of logarithmic functions int(log(x+1))dx