Respuesta :

Your answer is (3x+y)(x-4). (hope this helps.)
irspow
3x^2+xy-12x-4y  rearrange slightly...

3x^2-12x+xy-4y  now factor 1st and 2nd pair of terms...

3x(x-4)+y(x-4)  which is equal to

(3x+y)(x-4)
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