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= 5a + 8 + 8a + 3
= 13a + 11
nomer 2
a.) (x +7) ( x-9) = x² -9x +7x - 63
= x² - 2x - 63
b.) (2x-3) (x-4) = 2x² - 8x -3x + 12
= 2x² - 11x + 12
2. a. (x + 7) (x - 9) = x^{2} - 9x + 7x - 63 = x^{2} - 2x - 63
b. (2x - 3) (x - 4) = 2x^{2} - 8x - 3x + 12 = 2x^{2} - 11x + 12