Find those constants a, b, c, d such that f(z) = ax² + bxy + y² + i(x² + cxy + dy?)

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

Find those constants \(a, b, c, d\) such that 

\[ f(z) = ax^2 + bxy + y^2 + i(x^2 + cxy + dy^2) \]

**Solution Approach:**

The task is to determine specific values for constants \(a\), \(b\), \(c\), and \(d\) such that the function \(f(z)\) satisfies certain conditions (not specified in the excerpt provided). Here, \(f(z)\) is expressed in terms of \(z = x + yi\), where \(i\) is the imaginary unit.

### Function Breakdown:

1. **Real Part:**
   - \(ax^2 + bxy + y^2\)

2. **Imaginary Part:** 
   - \(x^2 + cxy + dy^2\)

### Further Steps:

To solve for the constants \(a, b, c, d\), typically, one would:

1. **Analyze Symmetry or Conditions:**
   - Based on the context (e.g., harmonic, analytic functions, etc.), utilize conditions like Cauchy-Riemann equations if \(f(z)\) is meant to be analytic.

2. **Equate Coefficients:**
   - Compare the coefficients obtained with standard forms to determine the values of \(a\), \(b\), \(c\), and \(d\).

3. **Constraints:**
   - Ensure any constraints or properties specified for \(f(z)\) (such as being harmonic) are satisfied.

This setup is often used in complex analysis or advanced calculus where expressions for complex-valued functions need simplification or verification against certain criteria. Further context would help refine these constant values.
Transcribed Image Text:**Problem Statement:** Find those constants \(a, b, c, d\) such that \[ f(z) = ax^2 + bxy + y^2 + i(x^2 + cxy + dy^2) \] **Solution Approach:** The task is to determine specific values for constants \(a\), \(b\), \(c\), and \(d\) such that the function \(f(z)\) satisfies certain conditions (not specified in the excerpt provided). Here, \(f(z)\) is expressed in terms of \(z = x + yi\), where \(i\) is the imaginary unit. ### Function Breakdown: 1. **Real Part:** - \(ax^2 + bxy + y^2\) 2. **Imaginary Part:** - \(x^2 + cxy + dy^2\) ### Further Steps: To solve for the constants \(a, b, c, d\), typically, one would: 1. **Analyze Symmetry or Conditions:** - Based on the context (e.g., harmonic, analytic functions, etc.), utilize conditions like Cauchy-Riemann equations if \(f(z)\) is meant to be analytic. 2. **Equate Coefficients:** - Compare the coefficients obtained with standard forms to determine the values of \(a\), \(b\), \(c\), and \(d\). 3. **Constraints:** - Ensure any constraints or properties specified for \(f(z)\) (such as being harmonic) are satisfied. This setup is often used in complex analysis or advanced calculus where expressions for complex-valued functions need simplification or verification against certain criteria. Further context would help refine these constant values.
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The given function is : fz=ax2+bxy+y2+i(x2+cxy+dy2)

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