9-b/
(a - 5) x (a + 3) + 9
9-c/
a² + 3a - 5a - 15 +9
a² - 2a - 6
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9-b/
(a - 5) x (a + 3) + 9
9-c/
a² + 3a - 5a - 15 +9
a² - 2a - 6