Can you double check if there is a typo on the first function
x=y^2 => y=sqrt(x), ...(case 1) or is it
y=x^2 => x=sqrt(y).... (case 2)
In any case, the procedure is the same. I will work out the problem where y=x² (case 2).
Let f1(x)=3x (line), and
Plot the two functions on a graph and determine the intersections.
Here is a plot (of case 2):
Call the intersections P1(0,0), P2(3,9).
For integration with respect to x, the limits of integration are x1,x2, and with respect to y, the limits are y1,y2.
1. integration with respect to x: (disk method).
Cut the region into vertical slices of thickness dx. When rotated about the x-axis, it will form a disk with a hole, of outside diameter f1(x), and inside diameter f2(x).
The volume of such a disk is therefore
The total volume is therefore
2. Integrate with respect to y: (shell method)
Here, we need the inverse of each function, such that
for a given y=f1(x), x=g(y).
This can be obtained by solving for x in terms of y:
g1(y) = x = y/3, and
g2(y) = x = sqrt(y)
To find the volume, again we will be cutting slices, of thickness dy. However, when the slice is revolved around the x-axis, it becomes a shell (or hollow cylinder) of thickness dy, the height is (g2(y)-g1(y)), and the elemental volume
dV = surface area * thickness
So the total volume
from y=0 to y=9
I get 162π/5 in both cases.
calculus - A region is bounded by the function y=2x^2+3 and the x-axis over the ...
Calculus - Consider the region bounded by the curves y=e^x, y=-e^x, and x=1. Use...
AP Calculus AB - What is the area of the region bounded by the graphs y=e^x, y=1...
calculus - find the volume of the solid bounded above by the surface z=f(x,y) ...
calculus - 1. Find the area of the region bounded by f(x)=x^2 +6x+9 and g(x)=5(x...
calculus - Consider the region bounded by the parabola y=x^2 and the line y=16...
Calculus AB/AP - Use the rectangles with the given dimensions to approximate the...
calculus - Consider the solid obtained by rotating the region bounded by the ...
calculus - 10). Find the area of the region bounded by the graph of f(x)=4lnx/x...
math - Consider the region in Quadrant 1 totally bounded by the 4 lines: x = 3, ...