Double Integration Check: Evaluating a Double Integral for a Triangle

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SUMMARY

The discussion focuses on evaluating the double integral \(\int\int (x^{2}(y+1) + e^{y})\) over a triangular region defined by the vertices (0,0), (1,1), and (-1,1). The correct limits of integration for this triangle are established as x = -y to x = y for the inner integral, and y = 0 to y = 1 for the outer integral. The participant emphasizes the importance of understanding the geometric representation of the triangle to derive the appropriate limits, rather than relying on integrating a square region.

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Homework Statement


Evaluate [tex]\int\int (x^{2}(y+1) + e^{y})[/tex] for a triangle with vertices at (0,0) (1,1) (-1,1)


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Integration

The Attempt at a Solution


The only this I wanted to check, is that integrating the square at y=0 to 1 and x=0 to 1 will give the correct answer (as the triangle is reflected on the y axis) and if not, how you get the limits.
 
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I don't see how "integrating the square at y = 0 to 1 and x = 0 to 1" relates to this problem, even if it happens to produce the right answer.

If you integrate first with respect to x and then with respect to y, your limits of integration will be x = - y to x = y, and then y = 0 to y = 1.
 

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