Question

expand (x+2y)^4

Answer 1

(x+2y)^(4)

(x^(4)+8x^(3)y+24x^(2)y^(2)+32xy^(3)+16y^(4))

x^(4)+8x^(3)y+24x^(2)y^(2)+32xy^(3)+16y^(4)

Answer 2

Hm it is similar to your other question; just use:
\[T= \left(\begin{matrix}n \\ k\end{matrix}\right)*a^{n-k}b^k\]
\[\sum_{r=0}^{4}\left(\begin{matrix}4 \\ r\end{matrix}\right)*(x)^{4-r}*(2y)^r\]

Answer 3

thank you @Luis_Rivera

Answer 4

kk