Question

Evaluate ∫9xdx. Here C is the constant of integration. Use abs(x) to denote |x|.

Answer 1

First of all, we must remember that:

`\int(1)/(x)dx=\ln|x|+C`

`\int(9)/(x)dx=9\int(1)/(x)dx=9\ln|x|+C`

Answer:

9*ln(abs(x)) + C