Question

Запишите произведение в виде многочлена
(-7m^2-8n^2)(-m^2+3n^2)​
(8x^2-3xy)(3x^3-xy)
(7x^3y^2-xy)(-2x^2y^2+5xy^3)

Answer 1

$1)\; (-7m^2-8n^2)(-m^2+3n^2)=7m^4-21m^2n^2+8m^2n^2-24n^4=\\\\=7m^4-13m^2n^2-24n^4\\\\\\2)\; (8x^2-3xy)(3x^3-xy)=24x^5-8x^3y-9x^4y+3x^2y^2\\\\\\3)\; \; (7x^3y^2-xy)(-2x^2y^2+5xy^3)=-14x^5y^4+35x^4y^5+2x^3y^3-5x^2y^4$