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NDA 2016
Exam
NDA
Year
2016
Subject
Mathematics
Chapter
Differential Equations

NDA 2016 · Mathematics · Differential Equations

What are the order and degree respectively of the differential...

What are the order and degree respectively of the differential equation whose solution is y=cx+c2−3\mathrmc3/2+2\mathrm{y}=\mathrm{cx}+\mathrm{c}^2-3 \mathrmc^{3 / 2}+2, where c is a parameter?

Options

  1. A1, 2
  2. B2, 2
  3. C1, 3
  4. D1, 4

Correct answer

D. 1, 4

Step-by-step solution

Given : Solution of differential equation is y=cx+c2−3c32+2y=c x+c^2-3 c^{\frac{3}{2}}+2...(1) To find order and degree of differential equation, we will find differential equation first. Now differentiating equation (1) w.r.t. xx and putting value of cc to remove it, we get dydx=c\frac{d y}{d x}=cy=xdydx+(dydx)2−3(dydx)32+2⇒(y−2)2+(dydx)4+(2x−9)(dydx)3\begin{aligned} & y=x \frac{d y}{d x}+\left(\frac{d y}{d x}\right)^2-3\left(\frac{d y}{d x}\right)^{\frac{3}{2}}+2 \\ & \Rightarrow(y-2)^2+\left(\frac{d y}{d x}\right)^4+(2 x-9)\left(\frac{d y}{d x}\right)^3\end{aligned}+(x2−2y+4)(dydx)2+(−2xy+4x)dydx=0+\left(x^2-2 y+4\right)\left(\frac{d y}{d x}\right)^2+(-2 x y+4 x) \frac{d y}{d x}=0 Hence order of differential equation is 1 and degree is 4 .
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