# calculus

find critical values for the function sqrt x^2+x-20

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1. Take the second derivative,set to zero, solve for x, then f(x)

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2. I don't know how to do that with the sqrt

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3. sqrt means something to the 1/2 power.

sqrt k= k^(1/2)

derviative of sqrt k= 1/2 * k^-1/2

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4. oh I remember that part but do you do the d/dx of the inside too?

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