Answer:
x² - 2x - 15
Explanation:
given
(x + 3)(x - 5)
each term in the second factor is multiplied by each term in the first factor, that is
x(x - 5) + 3(x - 5) ← distribute parenthesis
= x² - 5x + 3x - 15 ← collect like terms
= x² - 2x - 15
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