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= (-5 × 4y²) (-5 × -2y) (-5 × 8) dari (4 × 7y²) (4 × 6y) (4 × -5)
= -20y² + 10y - 40 dari 28y² + 24y - 20
= 28y² + 24y - 20 - (-20y² + 10y - 40)
= 28y² + 24y - 20 + 20y² - 10y + 40
= 28y² + 20y² + 24y - 10y - 20 + 40
= 48y² + 14y + 20
= -20y² + 10y - 40 dari 28y² + 24y - 20
= (28y² + 24y - 20) - (-20y² + 10y - 40)
= 28y² + 24y - 20 + 20y² - 10y + 40
= 48y² + 14y + 20