### Home > CALC > Chapter 8 > Lesson 8.1.4 > Problem 8-47

8-47.

Implicit differentiation.

Find all *y*-values in which the denominator of the derivative = 0.

Use the original function to find the corresponding *x*-value for each *y*-value you found in part (b).

There will be three values of *x* that work. That means there will be three coordinate points in which the slope is vertical: ( ____, 0 ), ( ____, 0 ) and ( ____, 0 ). (Obviously, this is NOT a function!)

The 2nd-derivative must be written in terms of *x* and *y* only.