Question

(x mũ2 +2xy-3)(-xy)

Answer 1

\(\left(x^2+2xy-3\right).\left(-xy\right)=\left[x^2.\left(-xy\right)\right]+\left[3xy.\left(-xy\right)\right]+\left[\left(-3\right).\left(-xy\right)\right]=-x^3y-3x^2y^2+3xy\)

Answer 2

=[x².(-xy)]+[2xy.(-xy)]+[-3.(-xy)]
=x³y+2x²y²-3xy