- #1
selig5560
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Homework Statement
∫∫ 1 / (2x + 3y), R = [0,1] x [1,2]
Homework Equations
- Iterated integrals
- u sub
The Attempt at a Solution
Here is my attempt at solving this (I must be screwing up on the algebra)
Integrating with respect to x
u = 2x, dy = 2
u^-2 du
u^-2 = - (1/u) [double chcked with wolfram alpha]
∫∫ (2x + 3y) ^ -2 -> -2 ∫ -(1/u) (2x + 3y) ^ -1
This is the part that stumps me...Sorry if I'm being vague. This is from Paul Online Notes Calculus III (http://tutorial.math.lamar.edu/Classes/CalcIII/IteratedIntegrals.aspx#MultInt_Iterated_Ex1d)
THe part I want to understand is how they got -1/2 * ... (2x+3y) ^ -1
Thanks!