Skills Handbook - Evaluating and Simplifying Expressions - Exercises - Page 890: 20

$4y-y^2$

We start with the given expression: $y(4-y)$ To simplify an algebraic expression, we must eliminate any parentheses and combine like terms. To eliminate parentheses, we apply the distributive property: $4y-y*y$ We multiply $y*y$ to get $y^2$: $4y-y^2$ Since there are no like terms, the expression has been simplified.