a) x (x² - 1) + 2x (4 + x²) - 3 (4x - x²)=x³-x+8x+2x³-12x+3x²=
=x³+2x³+3x²-x+8x-12x=3x³+3x²-5x
b) x² (y -xy) - y (x² - xy²)=x²y-x³y-x²y+xy³=-x³y+xy³
c) -3/4b (- 4a² - 8ab)=-3/4b·4(-a²-2ab)=-3b(-a²-2ab)=3a²b+6ab²
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a) x (x² - 1) + 2x (4 + x²) - 3 (4x - x²)=x³-x+8x+2x³-12x+3x²=
=x³+2x³+3x²-x+8x-12x=3x³+3x²-5x
b) x² (y -xy) - y (x² - xy²)=x²y-x³y-x²y+xy³=-x³y+xy³
c) -3/4b (- 4a² - 8ab)=-3/4b·4(-a²-2ab)=-3b(-a²-2ab)=3a²b+6ab²