Derivative at a Point Using Difference Quotient

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How to find the difference quotient using a point in this free math video tutorial by Mario's Math Tutoring. We go through an example in this video.

0:36 Formula for Finding the Difference Quotient at a Point
1:36 Example 1 Finding the Slope at (1,2) on f(x)=sq. rt.(x + 3)
3:06 Rationalizing by Multiplying by the Conjugate
4:40 Interpreting the Result

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this is the only source of information I have been able to find where I could make a difference quotient based on two points rather than a function, so thank you very much, sire.

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