A-Level Maths OCR B (MEI) (H640)

Be able to write $(a + bx)^n$ in the form $a^n\Bigg(1+\dfrac{bx}{a}\Bigg)^n$ and hence expand $(a + bx)^n$.

*$\Big|\dfrac{bx}{a}\Big| < 1$ when $n$ is not a positive integer.

Excludes: Proof of convergence.*