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=> 4(x + y) - (-7)(x - 2y)
=> (4x + 4y) - (-7x + 14y)
=> 4x + 7x + 4y - 14y = 11x - 10y
b. (y² - 5y + 4) dari (2y² - 3y + 7)
=> (y² - 5y + 4) - (2y² - 3y + 7)
=> y² - 2y² - 5y + 3y + 4 - 7
=> -y² - 2y - 3
=> y² + 2y + 3