Evaluate the expression 5y to the 4th minus y squared when y is equal to 3 so every place you see a y here we can just replace it with a three to evaluate it so it becomes 5 times three to the fourth power minus three squared, all I did is every time we saw a y here, I put a three there so what does this evaluate to, we have to remember our order of operations remember parenthesis comes first, sometimes it's referred to as PEMDAS