AM-697

Stationary points

A Math · Secondary 3 · Medium · Stationary points

The function

f(x) = x^3 - 4x

has a stationary point at

x = a

. Find the value of

a

.

$\pm\dfrac{2}{\sqrt{3}}$
$\pm\dfrac{4}{\sqrt{3}}$
$\pm\dfrac{\sqrt{3}}{2}$
$\pm 2$

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