General Binomial Expansion - Subtleties (Edexcel A-Level Mathematics): Quizzes

$|ax| < 1$

Powers of $x$ increase to infinity

$|x| < \frac{1}{8}$

$|x| < \frac{1}{7}$

$(1+ax)^n$

Factor as $3^{-2}(1 + \frac{2}{3}x)^{-2}$

$|x| < \frac{3}{2}$

$1 + x + \frac{3}{2}x^2$

$\frac{11}{2}$

$|x| \leq 1$