Question

Solve: $2\times 5x(10x^{2}y-100x{y}^2)$

Answer 1

$2\times 5x(10x^{2}y-100x{y}^2)=10\times x(10x^{2}y-100x{y}^2)=100x\ast x^{2}y-1000x\ast x{y}^2=100x^{3}y-1000x^2{y}^2$