If the derivativedx/dyexists at a point anddx/dy= 0, then the tangent line is vertical. Use this information and the given equation to answer the following questions-

y4 + 5 =y2 +x2

1) Find dx/dy

Ans:y4 + 5 =y2 +x2

4y3 =2y+ 2xdx/dy

(4y3 -2y)/ 2x= dx/dy

2) Find the points on the graph where the tangent line is vertical. Arrange the values from smallest to largest.

How do I do this one? Some one please help me with this.

(P.S.-please show the step so I will understand)