### 1) Define "u" for change of variables. Usually "u" will be the inner function in a composite function
2) Differentiate "u" to find "du"
3) Substitute in the integrand and simplify
4) If "x" still occurs anywhere in the integrand, take "u", solve for "x" in terms of "u", substitute, and simplify
5) Integrate
6) Substitute back for "u", so the answer is in terms of "x"