Question

se a = 2x +4y +5, b = 2x + 2y _3 e c = +4x _ y + 4 então a _ b + c e igual a)+ x + y + 12 b) + x +.2y + 12 c) + 4 x y + 12 d)+ 4x + 4y + 12 ​

Answer 1

A-B+C =

(2x+4y+5)-(2x+2y-3)+(4x-y+4)=
2x+4y+5-2x-2y+3+4x-y+4=
2x-2x+4x+4y-2y-y+5+3+4=
4x+y+12 #