Chapter 16: Problem 23
Find the general solution and also the singular solution, if it exists. $$ 4 x p^{2}-3 y p+3=0 $$
Short Answer
Expert verified
General solution: \(y = xp + \frac{3}{4p}\). Singular solution: \(x = 0, y = c\).
Step by step solution
01
Identify the Differential Equation
The given equation is \(4xp^2 - 3yp + 3 = 0\), where \(p\) is a substitution for \(\frac{dy}{dx}\). This is a first-order differential equation losely related to a Clairaut-type differential equation, which will help us identify both the general and singular solutions if they exist.
02
Express in Terms of Parametric Functions
Rewrite the equation as \(p = \frac{3y}{8x} + \frac{3}{8xp^2}\). Express \(y\) in parametric form: \(y = xp+\frac{3}{4p}\). Here, \(p\) acts as a parameter to provide general and singular solutions.
03
Solve for General Solution
To find the general solution, differentiate the parametric equation \(y = xp + \frac{3}{4p}\) with respect to \(x\). Set up the equation: \(\frac{dy}{dx} = p\). By solving for \(p\) using the equation, you maintain the form \(y = xp + \frac{3}{4p}\). This is the general solution parameterized by \(p\).
04
Find Singular Solution
To find the singular solution, differentiate \(y = xp + \frac{3}{4p}\) with respect to \(p\) and set the derivative equal to zero. The derivative is \(0 = x - \frac{3}{4p^2}\). Solving for \(x\) gives \(x = \frac{3}{4p^2}\). Substituting \(x\) back into the parametric form gives \(y = \frac{3}{2p}\). Replacing \(p\) with \(0\), check if solutions for constant exist. Singular solution is \(x = 0\), \(y = c\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Clairaut-type equation
A Clairaut-type equation is a special form of first-order differential equation. It is generally written as \( y = xp + f(p) \), where \( p = \frac{dy}{dx} \) and \( f(p) \) is a function of \( p \) alone. The uniqueness of Clairaut-type equations is that they can provide both general and singular solutions, depending on their algebraic structure and parameters.
To understand how Clairaut-type equations work, remember:
To understand how Clairaut-type equations work, remember:
- They frequently allow expressing \( y \) in terms of \( x \) using a parameter \( p \).
- The solution to such equations often includes constant and variable terms that involve the parameter \( p \).
General solution
The general solution in differential equations represents a family of solutions based on certain variables or parameters. For Clairaut-type equations, like our example equation \( 4xp^2 - 3yp + 3 = 0 \), the general solution is often expressed in a parametric form with a parameter \( p \).
The general solution is found by expressing \( y \) as a function of \( x \) and \( p \):
The general solution is found by expressing \( y \) as a function of \( x \) and \( p \):
- First, derive the parametric equation from the original expression.
- Using the derived form, ensure that \( y = xp + \frac{3}{4p} \) stays intact.
Singular solution
The singular solution to a differential equation is a particular solution that does not fall within the family of the general solutions. In Clairaut-type equations, identifying this solution involves a specific procedure.
For the equation \( 4xp^2 - 3yp + 3 = 0 \):
For the equation \( 4xp^2 - 3yp + 3 = 0 \):
- First, differentiate the parametric form \( y = xp + \frac{3}{4p} \) with respect to \( p \).
- Set this derivative equal to zero, which identifies points where the family of solutions changes character.
- Calculate \( x \) and substitute it back to find the corresponding \( y \).
First-order equations
First-order differential equations are the simplest type of differential equations, involving only the first derivative \( \frac{dy}{dx} \). They form the foundation for understanding more complex equations and have a variety of real-world applications.
In first-order differential equations, the solution often involves integrations and specific functions to describe the slope of a curve at any point. These equations are classified into several types, including:
In first-order differential equations, the solution often involves integrations and specific functions to describe the slope of a curve at any point. These equations are classified into several types, including:
- Linear and non-linear equations
- Separable and inseparable equations
- Exact and inexact equations