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# double integrals watch

1. i'm kind of stuck on the last one (putting it in the other order, that is). i tried integrating dy from -x to sqrt(x) and x from -1 to 1 but that didn't work out.
2. (Original post by StarvingAutist)
i'm kind of stuck on the last one (putting it in the other order, that is). i tried integrating dy from -x to sqrt(x) and x from -1 to 1 but that didn't work out.
EDIT
look at Q30 in this link
(very similar to yours)
3. (Original post by StarvingAutist)
i'm kind of stuck on the last one (putting it in the other order, that is). i tried integrating dy from -x to sqrt(x) and x from -1 to 1 but that didn't work out.
You need to split it into two separate integrals when you change order - you are integrating from in and from in - this should be clear if you sketch out the region - you cant cover the region with a single strip bounded by the same functions at both ends over .

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