Subtract the polynomials

9/23/2020

What is the difference between (y² - 4y + 9) - (3y² - 6y - 9) ?

(y² - 4y + 9) - (3y² - 6y - 9)
= y² - 4y + 9 - 3y² + 6y + 9 {removed parentheses, distributing negative sign through second set of parentheses}
= -2y² + 2y + 18 {combined like terms}

Ask the House