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-8p + 10q - 9r - 4p + 11q + 9r
-8p - 4p + 10q + 11q - 9r + 9r
-12p + 21q
b) -5(4y² - 2y + 8) - 4(7y² + 6y - 5)
-20y² + 10y - 40 - 28y² - 24y + 20
-20y² - 28y² + 10y - 24y - 40 + 20
-48y² - 14y - 20
= 4p + 8p - 11q - 10q - 9r + 9r
= 12p - 21q
b. (4(7y² + 6y - 5) - (-5(4y² - 2y + 8) = (21y² + 24y - 20) -(-20y² + 10y - 40)
= 21y² + 24y - 20 + 20y² - 10y + 40
= 21y² + 20y² + 24y - 10y - 20 + 40
= 41y² + 14y + 20