# help with double integration plz

• December 22nd 2008, 03:58 PM
Tommy
help with double integration plz
find the double intetration of volume D (4/5xy+9/11x^2*y^2)dxdy if x=1 ; y=x^3 ; y=-x^1/2
• December 22nd 2008, 10:12 PM
guigui51250
infraction...
• December 23rd 2008, 12:09 AM
mr fantastic
Quote:

Originally Posted by Tommy
find the double intetration of volume D (4/5xy+9/11x^2*y^2)dxdy if x=1 ; y=x^3 ; y=-x^1/2

Draw the region defined by the given curves. Then you will see that the double integral is the same as:

$\int_{x=0}^1 \int_{y = -x^{1/2}}^{y = x^3} \frac{4}{5} x y + \frac{9}{11} x^2 y^2 \, dy \, dx$.

It's much less work to do the integration in this order than the other way around (do yu see why?). Can you do the integrations?