Replace the variable with the given value
Simplify using order of operations
Compute the result
If there are multiple variables, substitute each given value
If the function is written in notation like f(x), evaluate by finding f at the specified input
If the input is an expression, substitute the entire expression into the function
If the function includes fractions, simplify carefully
If the function includes exponents, apply exponent rules before simplifying
If the function includes radicals, evaluate the radical after substitution
If the function is piecewise, use the rule that matches the input value
Check for domain restrictions before evaluating
Verify the final answer by rechecking the substitution and arithmetic