Hi guys and girls,, this is my first post here so hi to everybody !
Ok my questions is how do i calculate the volume of an object rotated on the x-axis
I have two functions f(x) = 2*sqrt(x) & g(x) = 8-x
fist i calculate the area from 0 to 4(Their intersection)
aw = g(x) - f(x)
int(aw, 'x', 0, 4)
it spits out : 40/3 which is correct
Now i have to rotate it against? the x-axis and calculate the volume
V = pi * int(aw^2, 'x', 0, 4)
Which is not the same answer as i have on my page with answers
The result on the page is : (352*pi)/3
What am i doing wrong?
Sorry for my english