Set the denominator equal to zero and exclude those values
For square roots, require the radicand to be greater than or equal to zero
For even roots, require the expression inside to be nonnegative
For logarithms, require the argument to be greater than zero
For rational exponents with even denominators, require the base to satisfy the root condition
Combine all restrictions from the expression
Write the domain as all real numbers except the excluded values, or in interval notation
Check for any additional restrictions from nested functions or compositions