The question is:

Find the volume generated when the finite region bounded by the given curves is rotated fully about the x-axis.

y^4=16x, x=1, x=4, y=0

If y^4=16x then y=2x - This is my curve.

Are the x values the limits?

Using the formula I can't get the correct answer. Can anyone help me out?

Pi * Integral(limits 4-1) of 2x