Question

expand ( X + Y + 2 )^3

Answer 1

(X+Y+Z)^3=

x^3+3x^2y+3x^2z+3xy^2+6xyz+3xz^2+y^3+3y^2z+3yz^2+z^3

If Z=2 then,

x^3+3x^2y+6x^2+3xy^2+12xy+12x+y^3+6y^2+12y+8