The binomial (x + 5) is a factor of x2 + 8x + 15. What is the other factor?

To factor x² + 8x + 15, find two numbers whose product is 15 and whose sum is 8. Those numbers are 5 and 3, so x² + 8x + 15 = (x + 5)(x + 3). Since (x + 5) is already given as one factor, the other factor is (x + 3), choice A.

AI-written and checked against the verified answer.