(x+a)

^{n}

=

^{n}C

_{0}x

^{n}a

^{0}+

^{n}C

_{1}x

^{n-1}a

^{1}+

^{n}C

_{2}x

^{n-2}a

^{2}+ ...+

^{n}C

_{r}x

^{n-r}a

^{r}+ ...+

^{n}C

_{n-1}x

^{1}a

^{n-1}+

^{n}C

_{n}x

^{0}a

^{n}

(x+a)

^{n}

= (r = 0 to n)Σ

^{n}C

_{r}x

^{n-r}a

^{r}

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