Question

(5+2y)(y^2-y+1) Ответы: 1) 5y^2+10y-15; 2) 2y^3+9y^2+4y-15; 3) 5y^2+10y+15; 4) 2y^3-9y^2+8y-15.

Answer 1

(5+2y)(y²-y+1)=5y²-5y+5+2y³-2y²+2y=
=2y³+3y²-3y+5

(5+2y)(y²-y+1)=5(y²-y+1) + 2y(y²-y+1)=5y²-5y+5 +2y³-2y²+2y=
=2y³+5y²-2y² -5y+2y+5=2y³+3y²-3y+5