factorise the following a²+12a-45
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Answer:
(a + 15)(a - 3)
Step-by-step explanation:
a² + 12a - 45
⇒ a² - 3a + 15a - 45
⇒ a(a - 3) + 15(a - 3)
⇒ (a + 15)(a - 3)