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= 5a + 8 + 8a + 3
= 13a + 11
b) 6p - 5q - 2r dan - 8p + 6q + 9r
= 6p - 5q - 2r + (-8p) + 6q + 9r
= -2p + q + 7r
c) 8x² + 4x - 21 dan 6x² - 14x + 7
= 8x² + 4x - 21 + 6x² - 14x + 7
= 14x² - 10x - 14
d) 2 (3a + 5b + 3) dan 4 (2b - 3a +6)
= 2 (3a + 5b + 3) + 4 (2b - 3a +6)
= 6a + 10b + 6 + 8b - 12a + 24
= -6a + 18b + 30
e) 4 (2x² - 3x + 5) dan 3 (4x² + 2x - 7)
= 4 (2x² - 3x + 5) + 3 (4x² + 2x - 7)
= 8x² - 12x + 20 + 12x² + 6x - 21
= 20x² -6x -1