Description: We're going to put our order of operations knowledge to work as we evaluate this expression. Exponents, specifically, are our focus here. Created by Sal Khan and Monterey Institute for Technology and Education. Evaluate the expression 5y to the fourth minus y squared when y is equal to 3. So it becomes 5 times 3 to the fourth power minus 3 squared. Remember, parentheses comes first.*Teacher Advisor is 100% free.