2y−5(y−3)
To simplify this....
2y - 5(y - 3)
Multiply the number outside the parenthesees by each number inside the parenthesees and add the products together. This is called "Distributing."
2y + (-5 * y) + (-5 * -3)
2y - 5y + 15
Combine like terms.
-3y + 15
