(3x-5y+4) (9x^2+25y^2+15xy-20y+12x+16)
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(3x-5y+4)(9x²+25y²+16+15xy+20y-12x)
(3x-5y+4)[(3x)²+(5y)²+(4)²-(3x)(-5y)-(-5y)(4)-(3x)(4)
=(3x)³+(-5y)³+(4)³-3X3xX-5yX4
=27x³-125y³+64+180xy
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