AM-2179

Stationary points

A Math · Secondary 4 · Hard · Stationary points

A function is defined by

S(x) = 4x\sqrt{25 - x^2}

. Find the value of

x

for which

S

has a stationary value, given that

x>0

.

$x=\sqrt{12.5}$
$x=\sqrt{25}$
$x=\sqrt{6.25}$
$x=5$

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