AM-1471

Binomial expansion

A Math · Secondary 4 · Easy · Binomial expansion

In the expansion of

(kx + \dfrac{1}{x})^2

, the coefficient of

x^2

is 10.

Find the value of

k

.

$\sqrt{10}$
$\sqrt{12}$
$\sqrt{15}$
$\sqrt{18}$

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