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Let ?(?) = (? − 5)√?. a) Find the intervals on which ?(?) is increasing and...

Let ?(?) = (? − 5)√?.
a) Find the intervals on which ?(?) is increasing and the intervals on which ?(?) is decreasing.
b) State the ?-values at which ?(?) has a local minimum or a local maximum and specify which.

Let ?(?) = ?^4 − 2?^3 + 3.
a) Find the intervals on which ?(?) is concave up and the intervals on which ?(?) is concave down.
b) State the x-values at which ?(?) has an inflection point.

Please explain the steps, thanks!
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