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## Homework Statement

Integral of $$ x^3\sqrt{x^2+16}dx $$

answer should give

$$ 1/5(x^2+16)^{5/2} -16/3(x^2+16)^{1/2}+C $$

## Homework Equations

x=atanθ

## The Attempt at a Solution

**Mod note:**The integral is ##\int x^3 \sqrt{x^2 + 16} dx##

The published answer is ##1/5(x^2+16)^{5/2} -16/3(x^2+16)^{1/2}+C##

To the OP: Using $ $ (i.e., with a space between the $ symbols) causes the browser to not render what's between the $ pairs. For inline LaTeX, you can use # # (no space) at the beginning and end.

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