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(6x+7)^2(3x+4)(x+1)-6
=(36x^2+84x+49)(3x^2+7x+4)-6
=(108x^4+252x^3+144x^2)+(252x^3+588x^2+336x)+(147x^2+343x+192-6)
=108x^4+(252+252)x^3+(144+588+147)x^2+(336+343)x+190
=108x^4+504x^3+879x^2+679x+190
============================
(3x+5)(3x+2)(12x^2+28x+19)
=(36x^2+84x+49)(3x^2+7x+4)-6
=(108x^4+252x^3+144x^2)+(252x^3+588x^2+336x)+(147x^2+343x+192-6)
=108x^4+(252+252)x^3+(144+588+147)x^2+(336+343)x+190
=108x^4+504x^3+879x^2+679x+190
============================
(3x+5)(3x+2)(12x^2+28x+19)
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