Answer:
x² - x - 12
Explanation:
(x + 3)(x - 4)
Each term in the second factor is multiplied by each term in the first factor , that is
x(x - 4) + 3(x - 4) ← distribute parenthesis
= x² - 4x + 3x - 12 ← collect like terms
= x² - x - 12
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