4. (a) Prove that M(x, y) + N(x, y) = 0 can be made exact using an integrating factor that = f(x+y) for some N--My М--N depends only on the sum x + y if and only if the expression function f. (b) Use the integrating factor found in part (a) to solve 3+ y + xY+ (3 +x + xy) = 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
icon
Related questions
Question

I get how to solve it as an exact equation, but I'm not seeing how to get to the supplied expression

**Problem 4:**

(a) Prove that \( M(x, y) + N(x, y) \frac{dy}{dx} = 0 \) can be made exact using an integrating factor that depends only on the sum \( x + y \) if and only if the expression 

\[
\frac{N_x - M_y}{M - N} = f(x + y)
\]

for some function \( f \).

(b) Use the integrating factor found in part (a) to solve \( 3 + y + xy + (3 + x + xy) \frac{dy}{dx} = 0 \).
Transcribed Image Text:**Problem 4:** (a) Prove that \( M(x, y) + N(x, y) \frac{dy}{dx} = 0 \) can be made exact using an integrating factor that depends only on the sum \( x + y \) if and only if the expression \[ \frac{N_x - M_y}{M - N} = f(x + y) \] for some function \( f \). (b) Use the integrating factor found in part (a) to solve \( 3 + y + xy + (3 + x + xy) \frac{dy}{dx} = 0 \).
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

Blurred answer
Recommended textbooks for you
Advanced Engineering Mathematics
Advanced Engineering Mathematics
Advanced Math
ISBN:
9780470458365
Author:
Erwin Kreyszig
Publisher:
Wiley, John & Sons, Incorporated
Numerical Methods for Engineers
Numerical Methods for Engineers
Advanced Math
ISBN:
9780073397924
Author:
Steven C. Chapra Dr., Raymond P. Canale
Publisher:
McGraw-Hill Education
Introductory Mathematics for Engineering Applicat…
Introductory Mathematics for Engineering Applicat…
Advanced Math
ISBN:
9781118141809
Author:
Nathan Klingbeil
Publisher:
WILEY
Mathematics For Machine Technology
Mathematics For Machine Technology
Advanced Math
ISBN:
9781337798310
Author:
Peterson, John.
Publisher:
Cengage Learning,
Basic Technical Mathematics
Basic Technical Mathematics
Advanced Math
ISBN:
9780134437705
Author:
Washington
Publisher:
PEARSON
Topology
Topology
Advanced Math
ISBN:
9780134689517
Author:
Munkres, James R.
Publisher:
Pearson,