Answer:
y = (x + 2)(x - 2)(x + 3)
Explanation:
y = x³ + 3x² - 4x - 12
y = (x³ + 3x²) + (-4x - 12)
y = x²(x + 3) - 4(x + 3)
y = (x² - 4)(x + 3)
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