3(x + 4)
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3x + 12 can also be written as 3(x + 4)
Since both terms here are divisble by 3 then divide by 3 and factor our a 3...9/3x + 12/33(3x+4)
15x^2+3x-12 3(5x^2+x-4)=Answer
3x^4 - 12 = 3(x^4 - 4) = 3(x² + 2)(x² - 2)
(3x - 2)(2x + 6) or 2(3x - 2)(x + 3)