Binomial Theorem/Examples/(1 + x)^7

Example of Use of Binomial Theorem

 * $\left({1 + x}\right)^7 = 1 + 7 x + 21 x^2 + 35 x^3 + 35 x^4 + 21 x^5 + 7 x^6 + x^7$

Proof
As can be seen, the digits are those from the $7$th row of Pascal's triangle: