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=15x³y+3x²y-30x²y-6xy
=15x³y-27x²y-6xy
2.(x²-x-2)(x+3)=x³+3x²-x²-3x-2x-6
=x³+2x²-5x-6
(3x²y - 6xy)(5x + 1)
3x³y + 3x²y - 30x²y + 6xy
3x³y - 27x²y + 6xy
(x² - x - 2)(x + 3)
x³ + 3x² - x² - 3x - 2x - 6
x³ + 2x² - 5x - 6