$$(a x + b y)^n = \sum_{k=0}^{n} {n\choose k} (a x)^{n-k} (a y)^k$$

How to use the calculator

Enter coefficients $a$ and $b$ as integers, decimals or fractions of the form p/q as shown in the example below . Enter the exponent $n$ as a positive integer gretaer than 1 and press "enter".