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Question

Difficulty Level:

Medium

MCQ

$f(x)=(x-2)(x+4)(x+5)(x-1)(x-9)$ has zeros at $x=-5, x=-4, x=1, x=2$ , and $x=9$ . What is the sign of $f$ on the interval $-4<x<1$ ?

Select all that apply :

$f$ is always negative in the interval

$f$ is always positive in the interval

$f$ is sometimes positive Sometimes negative in the interval.

None of the above

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