Class CBSE Class 12 Mathematics Differential Equations Q #644
KNOWLEDGE BASED
UNDERSTAND
1 Marks 2024 AISSCE(Board Exam) MCQ SINGLE
The integrating factor of the differential equation \((x+2y^{2})\frac{dy}{dx}=y(y>0)\) is:
(A) \(\frac{1}{x}\)
(B) x
(C) y
(D) \(\frac{1}{y}\)
Correct Answer: D

AI Tutor Explanation

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Step-by-Step Solution

The given differential equation is \((x+2y^{2})\frac{dy}{dx}=y\).

We can rewrite this as \(\frac{dx}{dy} = \frac{x+2y^2}{y}\).

Further simplifying, we get \(\frac{dx}{dy} = \frac{x}{y} + 2y\).

Rearranging the terms, we have \(\frac{dx}{dy} - \frac{1}{y}x = 2y\).

This is a linear differential equation of the form \(\frac{dx}{dy} + P(y)x = Q(y)\), where \(P(y) = -\frac{1}{y}\) and \(Q(y) = 2y\).

The integrating factor (IF) is given by \(e^{\int P(y) dy}\).

So, \(IF = e^{\int -\frac{1}{y} dy} = e^{-\int \frac{1}{y} dy} = e^{-\ln|y|} = e^{\ln|y^{-1}|} = \frac{1}{y}\) (since y > 0).

Correct Answer: \(\frac{1}{y}\)

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AI Suggestion: Option D

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Pedagogical Analysis

Bloom's Taxonomy: UNDERSTAND

Nature: KNOWLEDGE

Reasoning: The question requires understanding of differential equations and the process of finding the integrating factor. It is a standard problem type found in textbooks.