Compute the volume of the solid

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Homework Statement



Computer the volume of the solid bounded by the xz plane, the yz plane, the xy plane, the planes x = 1 and y = 1, and the surface z = x2 + y2

Homework Equations



None.

The Attempt at a Solution



Since the solid is bounded by the xz plane, the yz plane, the xy plane, it is assumed that the values of x, y, and z all equal 0. And since x = 1 and y = 1, the limits of integration is:

0 \leq x \leq 1

0 \leq y \leq 1

Thus, the double integral is:

\int \int x2 + y4 dA

and the limits of integration is 0 \leq x \leq 1, 0 \leq y \leq 1.

After calculating the integral, I got the answer \frac{8}{15}. Can anyone verify my work?
 
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number0 said:

Homework Statement



Computer the volume of the solid bounded by the xz plane, the yz plane, the xy plane, the planes x = 1 and y = 1, and the surface z = x2 + y2

Homework Equations



None.

The Attempt at a Solution



Since the solid is bounded by the xz plane, the yz plane, the xy plane, it is assumed that the values of x, y, and z all equal 0. And since x = 1 and y = 1, the limits of integration is:

0 \leq x \leq 1

0 \leq y \leq 1

Thus, the double integral is:

\int \int x2 + y4 dA

and the limits of integration is 0 \leq x \leq 1, 0 \leq y \leq 1.

After calculating the integral, I got the answer \frac{8}{15}. Can anyone verify my work?
That's what I get, too.

For future reference, here is the integral I evaluated, using LaTeX.
\int_{x = 0}^1 \int_{y = 0}^1 x^2 + y^4~dy~dx

Click the integral to see my LaTeX code.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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