Find factors of q² -q - 12
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q² - q - 12 = 0
⇒ q² -4q + 3q - 12 = 0
⇒ q(q - 4) + 3(q - 4) = 0
⇒ (q - 4) × (q + 3) = 0
⇒ q = 4 OR q = -3
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