The Student Room Group

Double integration help

Screen Shot 2018-10-13 at 13.44.58.png

I understand how to get compute a double integral but I haven't seen it like this, with dA. How do I do this question?
Sketch your region of integration and the function f = (2-x)

The double integral calculates the region above your rectangular region of integration and below the function.

Now you have a visual idea of what you're trying to find, next compute the double integral in any order, that is either 0203(2x)dydx\displaystyle \int_{0}^{2} \int_{0}^{3} (2-x)dydx or 0302(2x)dxdy\displaystyle \int_{0}^{3} \int_{0}^{2} (2-x)dxdy

Quick Reply