If the solution of differential equation $x^2 \frac{d^2 y}{d x^2}+2 x \frac{d y}{d x}=12 y$ is $y=A x^m+B x^{-n}$ then find the value of $m+n$, if $m \,\&\, n \in N$.

JEE MATHEMATICS MCQ: DIFFERENTIAL EQUATIONS

1 Easy

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Application +4 | -1

If the solution of differential equation

x^2 \frac{d^2 y}{d x^2}+2 x \frac{d y}{d x}=12 y

y=A x^m+B x^{-n}

then find the value of

m+n

, if

m \,\&\, n \in N

View answer and explanation

Correct option: A

Option A (7) is correct because by substituting the given solution into the differential equation and solving for m and n, we find that m+n = 7.

Practice All Chapter MCQs →

y=y(x)

\left(3 y^{2}-5 x^{2}\right) y d x+2 x\left(x^{2}-y^{2}\right) d y=0

y(1)=1

\left|(y(2))^{3}-12 y(2)\right|

x

{x^2} + {y^2} = 1

\left( {y' = \frac{{dy}}{{dx}},y'' = \frac{{{d^2}y}}{{d{x^2}}}} \right)

x = A\cos 4t + B\sin 4t,

\frac{{{d^2}x}}{{d{t^2}}}

y=y_{1}(x)

y=y_{2}(x)

\frac{d y}{d x}=y+7

y_{1}(0)=0

y_{2}(0)=1

y=y_{1}(x)

y=y_{2}(x)

y=y(t)

\frac{d y}{d t}+\alpha y=\gamma e^{-\beta t}

\alpha>0, \beta>0

\gamma>0

\lim \limits_{{x \rightarrow \infty}} y(t)