Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NDA 2025
Exam
NDA
Year
2025
Subject
Mathematics
Chapter
Differential Equations

NDA 2025 · Mathematics · Differential Equations

Consider the following statements:I. y = xe^ 2x is the solution of...

Consider the following statements:I. y=xe2xisthesolutionofy = xe^{2x} is the solution of\dfrac{dy}{dx} =y(2+1x)y \left(2 + \dfrac{1}{x}\right).II. y=xln⁡∣x∣+cxy = x\ln|x| + cx is the solution of dydx=x+yx.\dfrac{dy}{dx} = \dfrac{x + y}{x}.Which of the statements given above is/are correct?

Options

  1. AI only
  2. BII only
  3. CBoth I and II
  4. DNeither I nor II

Correct answer

C. Both I and II

Step-by-step solution

For Statement I:

Given y=xe2xy = xe^{2x}

Differentiating with respect to xx:

dydx=e2x+2xe2x=e2x(1+2x)\dfrac{dy}{dx} = e^{2x} + 2xe^{2x} = e^{2x}(1 + 2x)

Also, y(2+1x)=xe2x(2x+1x)=y\left(2 + \dfrac{1}{x}\right) = xe^{2x} \left(\dfrac{2x + 1}{x}\right) =e^{2x}(2x + 1)<br><br>Sincedydx=<br><br>Since \dfrac{dy}{dx} = y\left(2 + \dfrac{1}{x}\right), Statement I is correct.

For Statement II:

Given y=xln⁡∣x∣+cxy = x\ln|x| + cx

Differentiating with respect to xx:

\dfrac{dy}{dx} = \ln|x∣+x(1x)+x| + x\left(\dfrac{1}{x}\right) + c = \ln|x| + 1 + c<br><br>Also,x+yx=1+yx=1+xln⁡∣x∣+cxx=1+ln⁡∣x∣+c<br><br>Also, \dfrac{x + y}{x} =1 + \dfrac{y}{x} =1 + \dfrac{x\ln|x| + cx}{x} =1 + \ln|x| + c

Since dydx=x+yx,StatementIIiscorrect.<br><br>BothstatementsI\dfrac{dy}{dx} = \dfrac{x + y}{x},Statement II is correct.<br><br>Both statements I and II are correct.

Answer: Both I and II
Practice Differential Equations on Quantrex Academy →

More from Differential Equations

Passage: Consider the differential equation e^ x+y (dy)/(dx)=e^ x-y . Question: What is… NDA 2026What is the solution of the differential equation ((dy)/(dx))=p when y(0)=q ? NDA 2026Passage: Consider the differential equation e^ x+y (dy)/(dx)=e^ x-y . Question: What is… NDA 2026What is the degree of the differential equation ((d^2y)/(dx^2))^ (3)/(2) = ((dy)/(dx))^… NDA 2025If k is an arbitrary constant, then what is the general solution of the equation (x +… NDA 2025What are the order and degree respectively of the differential equation \ 2-((d y)/(d… NDA 2024Paragraph: Let y d x+(x-y^3) d y=0 be a differential equation. Question: What is the… NDA 2024The differential equation, representing the curve y=e^x(a x+b x) where a and b are… NDA 2024Paragraph: Let y d x+(x-y^3) d y=0 be a differential equation. Question: What are the… NDA 2024If (d y)/(d x)=2 e^x y^3, y(0)=(1)/(2) then what is 4 y^2 (2-e^x) equal to? NDA 2024Let y_1(x) and y_2(x) be two solutions of the differential equation (d y)/(d x)=x . If… NDA 2024A parabola pases through (1,2) and satisfies the differential equation (d y)/(d x)=(2… NDA 2023A parabola pases through (1,2) and satisfies the differential equation (d y)/(d x)=(2… NDA 2023What are the order and the degree respectively of the differential equation x^2((d^3… NDA 2023What is the differential equation of all parabolas of the type y^2=4 a(x-b) ? NDA 2023Paragraph: Suppose E is the differential equation representing family of curves y^2=2 c… NDA 2023 Full Differential Equations list Differential Equations JEE Maths PYQsJEE Mathematics PYQs All NDA PYQs