High School Math : Using Implicit Differentiation

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Specific Derivatives

An ellipse is represented by the following equation:

What is the slope of the curve at the point (3,2)?

Possible Answers:

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Correct answer:

Explanation:

It would be difficult to differentiate this equation by isolating . Luckily, we don't have to.  Use to represent the derivative of  with respect to and follow the chain rule.

 

(Remember, is the derivative of  with respect to , although it usually doesn't get written out because it is equal to 1. We'll write it out this time so you can see how implicit differentiation works.)

 

Now we need to isolate by first putting all of these terms on the same side:

This is the equation for the derivative at any point on the curve. By substituting in (3, 2) from the original question, we can find the slope at that particular point:

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