Resposta :
A=3X -4 +Y,B=X+15y e C+5 +xy2
a)2a+BC
A=3x+y-4
B=x+15y
C=5+xy^2
2A=6x+2y-8
[tex]BC=(x+15y)(5+xy^2)=5x+x^2y^2+75y+15xy^3[/tex]
[tex]2A+BC=6x+2y-8+5x+x^2y^2+75y+15xy^3=[/tex]
[tex]=11x+77y+x^2y^2+15xy^3-8[/tex]
A=3X -4 +Y,B=X+15y e C+5 +xy2
a)2a+BC
A=3x+y-4
B=x+15y
C=5+xy^2
2A=6x+2y-8
[tex]BC=(x+15y)(5+xy^2)=5x+x^2y^2+75y+15xy^3[/tex]
[tex]2A+BC=6x+2y-8+5x+x^2y^2+75y+15xy^3=[/tex]
[tex]=11x+77y+x^2y^2+15xy^3-8[/tex]