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Your factors must begin 3x and x to give 3x2. The factors of 12 are 1/12, 2/6 and 3/4. Which pair, together with 3x and x, can add to -5? 3 and 4 seem to fit the bill:

(3x + 4)(x - 3)

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14y ago
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Q: How do you factor 3x squared minus 5x minus 12?
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