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Asked Oct 16, 2019

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Can you help me step by step?

Step 1

Critical points of a function *f* are the points in the domain of *f* where the derivative is either zero or is not defined.

To find the critical points of a given function, we differentiate the function and set the derivative equal to zero, this (usually) gives us x-values where the derivative is zero and in addition to this we also look for x-vales at which derivative may not be defined.

All these x-values found form the set of critical points for the given function.

We start by differentiation the given function as shown:

Step 2

Next we set the derivative found equal to zero as shown:

Step 3

Observe that 2x-6 being a linear function is defined for all values of *x*.

Thus, since we have found only one x-value ...

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