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    Double Integral : Horizontal and Vertical Simple Methods

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    I have managed to evaluate the double integral using the horizontal simple method, and answer 63. But when I reverse the order (vertical simple method) I cannot reach the same answer of 63, I get 65.

    1) Evaluate the double integral of f(x,y)=x+4y^2 over the triangular region with vertices (-2,2) (4,2) & (1,-1)

    Check that reversing the order of integration gives the same answer?

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    Solution Preview

    Please see the attached file for the complete solution.

    We know that the equations of the given lines (sides) are y=-x, y=x+2 and y=2. Then if we ...

    Solution Summary

    A mystery is solved as to why two methods of integration give a supposedly different result.