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2.
a. (8a + 4) - (2a - 5) = 8a + 4 - 2a + 5
= 6a + 9
b. (7a² - 9) - (8a² + 14) = 7a² - 9 - 8a² - 14
= -a² - 23
c. (x² + 5x) - (-3x² - 9x) = x² + 5x + 3x² + 9x
= 4x² + 14x
semoga membantu ya :)