Find coordinates of the curve where the tangent line is horizontal
- 1. Do implicit differation to get y'
- 2. Get y' on one side
- 3. Make y' be 0 so you have f(x)=0
- 4. Solve for x
- 5. Plug in x values into original equation (set to y= ____)
(Remember: negative value can't be under a square root)