Question

expand: x+2 to the third power

Answer 1

you mean (x+2)^3?
if that is it, it's (x+2)(x+2)(x+2)=(x^2+4x+4)(x+2)=(x^3+2x^2+4x^2+8x+4x+8)
simplifies to:
\[x ^{3}+6x ^{2}+12x+8\]