Double Integral

[KEYWEST17]

Have no idea how to do this and it is do in an hour. Someone please help!

 

[tkhunny]

No one has any idea how to do it until you define "A".

 

[KEYWEST17]

You can either intergrate as dydx or dxdy. The order does not matter is what that means.

 

[tkhunny]

Really...

Okay, start with dx and let's see what you get for the first part.

 

[KEYWEST17]

x=0 to x=5 (2xy+10y^2+20y) from y=0 to y=1

2x(1)+10(1)^2+20(1)-2x(0)+10(0)^2+20(0)

x=0 to x=5 (2x+30)= x^2+30x from x=0 to x=5

(5)^2+30(5)

25+ 150=175

175 is incorrect though

 

[tkhunny]

Where did you get [0,5] and [0,1]? These might be the definition I was looking for.

You MUST be more careful. Right off, it should be 5y^2, not 10y^2.

Maybe you could try being neat and orderly. Really, slopping through it will NOT help.

 

[KEYWEST17]

Thanks for picking up my mistake. I keep making small ones but thats what will make and break and answer.

 

[tkhunny]

Well, stop it! Really, slow down, take a deep breath, be more careful and formal with your notation. Notation will save you if you let it.