AM-1986

Stationary points

A Math · Secondary 4 · Medium · Stationary points

The function

f(x)=x^3+3x^2-9x

has stationary points at

x=a

and

x=b

. Find the values of

a

and

b

.

$a=-3,\ b=1$
$a=-1,\ b=3$
$a=-3\text{ only}$
$a=1\text{ only}$

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