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Question: Answered & Verified by Expert
If $u(x)$ and $v(x)$ are two independent solutions of the differential equation $\frac{d^{2} y}{d x^{2}}+b \frac{d y}{d x}+c y=0$ then additional solution(s) of the given differential equation is(are)
MathematicsDifferential EquationsWBJEEWBJEE 2014
Options:
  • A $y=5 u(x)+8 v(x)$
  • B $y=c_{1}\{u(x)-v(x)\}+c_{2} v(x), c_{1}$ and $c_{2}$ are arbitrary constants
  • C $y=c_{1}u(x) v(x)+c_{2} u(x) / v(x) . \quad c_{1}$ and $c_{2}$ are arbitrary constants
  • D $y=u(x) \vee(x)$
Solution:
1461 Upvotes Verified Answer
The correct answers are: $y=5 u(x)+8 v(x)$, $y=c_{1}\{u(x)-v(x)\}+c_{2} v(x), c_{1}$ and $c_{2}$ are arbitrary constants
We know that $u(x)$ and $v(x)$ are two independent solutions of the given differential equation, then their linear combination is also the solution of the given equation.
Here, we see that $y=5 u(x)+8 v(x)$ is a linear combination and $y=c_{1}\{u(x)-v(x)\}+c_{2} v(x)$ is also a linear combination of two independent solutions.

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