We have to expand the expression
Using the binomial theorem. Let us remember what says the Binomial theorem
Let a and b real numbers and n a natural number then we have the next formula:
Now in our particular problem we have to identify the terms in the formula, and then apply it.
Therefore, to find the expansion we have to calculate the combinatorial coefficients, for that, we will use the formula given in the first draw, as follows:
Now, with this terms, we will apply the formula to find:
Where the final line in the last equation is the expansion required.