AM-1325

Binomial expansion

A Math · Secondary 4 · Medium · Binomial expansion

Find the first three terms, in ascending powers of

x

, of the expansion of

\left(1 - \dfrac{x}{4}\right)^5

.

$1 - \dfrac{5}{4}x + \dfrac{5}{8}x^2$
$1 + \dfrac{5}{4}x + \dfrac{5}{8}x^2$
$1 - \dfrac{5}{4}x + \dfrac{5}{16}x^2$
$1 - \dfrac{5}{2}x + \dfrac{5}{8}x^2$

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