Question

9x^(3/5)-5x^(6/5); c=0 Is a vertical cusp or vertical tangent.

f'(x)= (27/(x^2)^(1/5))-6(x)^(1/5)

Answer 1

a) vertical tangent
b) neither
c) both
d) vertical cusp

Answer 2

What Im unsure about is that f'(x) is positive on some part of x values coming from the left but for the rest its negetive