Question

выполни сложение и вычитание многочленов:
а) (8m²+5m)+(1-6m)=
b)(x²+5xy-y²)-(6xy+9y²-8x²)=

Answer 1

a) (8m^2+5m)+(1-6m)

8m^2+5m+1-6m

= 8m^2-m+1

b) (x^2+5xy-y^2)-(6xy+9y^2-8x^2)

x^2+5xy-y^2-6xy-9y^2+8x^2

9x^2-xy-10y^2

9x^2+9xy-10xy-10y^2

9x*(x+y)-10y*(x+y)

= (x+y)*(9x-10y)