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DIFFERENTIAL EQUATIONS — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSDIFFERENTIAL EQUATIONS5 Marks
Question
For the following differntial equations verify that the accompanying function is a solution:
Differential equation Function
$\text{x}\frac{\text{dy}}{\text{dx}}+\text{y}=\text{y}^2$ $\text{y}=\frac{\text{a}}{\text{x}+\text{a}}$
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Answer

We have $\text{y}=\frac{\text{a}}{\text{x}+\text{a}}$ $\Rightarrow\text{xy}+\text{ay}=\text{a}$ $\Rightarrow\text{xy}=\text{a}(1-\text{y})$ $\Rightarrow\frac{\text{xy}}{1-\text{y}}=\text{a}$ Given differential equation $\text{x}\frac{\text{dy}}{\text{dx}}+\text{y}=\text{y}^2$ Differentiating both sides of (1) with respect to x, we get $\frac{\text{xy}\Big(0-\frac{\text{dy}}{\text{dx}}\Big)-(1-\text{y})\Big(\text{x}\frac{\text{dy}}{\text{dx}}+\text{y}\Big)}{(\text{xy})^2}=0$ $\Rightarrow\text{xy}\Big(-\frac{\text{dy}}{\text{dx}}\Big)-(1-\text{y})\Big(\text{x}\frac{\text{dy}}{\text{dx}}+\text{y}\Big)=0$ $\Rightarrow-\text{xy}\frac{\text{dy}}{\text{dx}}-\text{x}\frac{\text{dy}}{\text{dx}}-\text{y}+\text{xy}\frac{\text{dy}}{\text{dx}}+\text{y}^2=0$ $\Rightarrow-\text{x}\frac{\text{dy}}{\text{dx}}-\text{y}+\text{y}^2=0$ $\Rightarrow\text{x}\frac{\text{dy}}{\text{dx}}+\text{y}=\text{y}^2$Hence, the given function is the solution to the given differential equation.

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