The binomial (a+5) is a factor of a2+7a+10. What is the other factor?

Factor the quadratic by finding two numbers whose product is 10 and whose sum is 7: 5 and 2. Thus a² + 7a + 10 = (a + 5)(a + 2). Since (a + 5) is already one factor, the other factor is (a + 2), choice A.

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