Question

Dado os polinômios A = (3r - 2) x (2r + 1) e B = (2r - 1) x r e C = (2r)². Determine A - (B + C).

Answer 1

A=(3r-2)(2r+1)=6r^2+3r-4r-2
A=6r^2-r-2

B=(2r-1)r=2r^2-r

C=(2r)^2=4r^2

A-(B+C)=
(6r^2-r-2)-((2r^2-r)+(4r^2))
6r^2-r-2-(6r^2-r)
6r^2-r-2-6r^2+r=-2

A-(B+C)=-2