Linear Differential Equations and their Solution using Integrating Factor

# Linear Differential Equations and their Solution using Integrating Factor Video Lecture | Mathematics (Maths) Class 12 - JEE

## Mathematics (Maths) Class 12

204 videos|288 docs|139 tests

## FAQs on Linear Differential Equations and their Solution using Integrating Factor Video Lecture - Mathematics (Maths) Class 12 - JEE

 1. What is a linear differential equation?
Ans. A linear differential equation is a differential equation in which the unknown function and its derivatives appear only in a linear combination. It can be written in the form: $a_0(x)y + a_1(x)\frac{dy}{dx} + a_2(x)\frac{d^2y}{dx^2} + \ldots + a_n(x)\frac{d^ny}{dx^n} = f(x)$ where $$y$$ is the unknown function, $$a_0(x), a_1(x), \ldots, a_n(x)$$ are coefficients, and $$f(x)$$ is a given function.
 2. How can we solve linear differential equations using an integrating factor?
Ans. To solve a linear differential equation using an integrating factor, follow these steps: 1. Rewrite the equation in the standard form: $$\frac{dy}{dx} + P(x)y = Q(x)$$. 2. Identify the coefficient of $$y$$ as $$P(x)$$ and the function on the right side as $$Q(x)$$. 3. Find the integrating factor, denoted by $$I(x)$$, which is calculated as $$I(x) = e^{\int P(x) dx}$$. 4. Multiply the entire equation by the integrating factor $$I(x)$$. 5. Simplify the equation and integrate both sides. 6. Solve for the constant of integration, if necessary, to obtain the general solution.
 3. What is the purpose of the integrating factor in solving linear differential equations?
Ans. The integrating factor is introduced in the process of solving linear differential equations to convert the equation into an exact differential equation. It allows us to multiply the entire equation by a suitable function that helps us integrate both sides and obtain the general solution. The integrating factor ensures that the equation becomes solvable and simplifies the solution process.
 4. Are linear differential equations always solvable using an integrating factor?
Ans. No, linear differential equations are not always solvable using an integrating factor. The method of integrating factor is specifically applicable to linear differential equations where the coefficients of the unknown function and its derivatives form a linear combination. For other types of differential equations, different solution methods need to be employed.
 5. Can integrating factor be used to solve nonlinear differential equations?
Ans. No, the integrating factor method is not applicable to solve nonlinear differential equations. Nonlinear differential equations involve nonlinear combinations of the unknown function and its derivatives, which cannot be transformed into an exact differential equation using the integrating factor. Nonlinear differential equations often require different solution techniques such as separation of variables, substitution, or numerical methods.

## Mathematics (Maths) Class 12

204 videos|288 docs|139 tests

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