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help please ? find the critical numbers of f,describe the open intervals on which f is increasing or decreasing locate all relative extrema

Mathematics
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calculus...? whats the equation
|dw:1363827249708:dw|
critical numbers are when derivative equals zero....right?

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Other answers:

so the derivative is |dw:1363827381385:dw|
set it equal to zero and find value of x
not to butt in, but you certainly don't need calculus for this it is a quadratic, therefore a parabola the leading coefficient is positive, so it open up the first coordinate of the vertex is \(-4\) so it decrease on \((-\infty, -4)\) and increases on \((-4,\infty)\)
@satellite73 is there any relative extrema here?

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