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a. (5a + 8) + (8a + 3) = 5a + 8 + 8a + 3
= 5a + 8a + 8 + 3
= 13a + 11
b. (6p - 5q - 2r) + (-80 + 6q + 9r) = 6p - 5q - 2r - 80 + 6q + 9r
= 6p - 5q + 6q - 2r + 9r - 80
= 6p + q + 7r - 80
Kurangkanlah =
a. (7a + 14) - (9a + 12) = 7a + 14 - 9a - 12
= 7a - 9a + 14 - 12
= -2a + 2
b. (2x² + 15x - 18) - (11x² - 17x + 24) = 2x² + 15x - 18 - 11x² + 17x - 24
= 2x² - 11x² + 15x + 17x - 18 - 24
= -9x² + 32x - 42