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= 5x - 6y (D)
2 dikalikan dengan -3y = -6y
2 dikalikan dengan xy = 2xy
= 2x - 6y + 2xy - 2xy + 3x
= 2x + 3x - 6y + 2xy - 2xy
= 5x - 6y (D)
6. =x dikalikan dengan 3 = 3x
x dikalikan dengan -2x = -2x²
= 3x - 2x² + 6x - 8
= 3x + 6x - 2x² - 8
= 9x - 2x² - 8