1. Where n is a positive integer. Consider the expansion of

2. Work out the expansions of
(ii)
(iii)

3. For relatively small values of n, the full expansion might be required
For relatively small values of n, the full expansion might be required. The coefficients are obtained from Pascal’s triangle.
The terms are homogeneous
The powers of a decrease whilst the powers of b increase.

4. Example
Write down the expansion of
Solve the equation

5. Example
Write down the expansion of
(i)
(ii)
And simplify coefficients