Question

(2x³y²-xy) × (xy+2x³y²)

Answer 1

Se foloseste formula:
(a-b)(a+b)=$a^{2} - b^{2}$, unde a=$2 x^{3} y^{2}$ si b=xy:

($2 x^{3} y^{2}$ -xy)($2 x^{3} y^{2}$ +xy)=

=$4 x^{6} y^{4}$ -$x^{2} y^{2}$