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Provide solution for RD Sharma maths class 12 chapter Differential Equation exercise 21.2 question 16 subquestion (x)

Answers (1)

Answer:

 The required equation is

x\frac{\mathrm{d} y}{\mathrm{d} x}=y\, log\, y

Hint:

 Differentiating the given equation with respect to x

Given:

 y=e^{ax}

Solution:

y=e^{ax}

Differentiating with respect to x

\begin{aligned} &\frac{\mathrm{d} y}{\mathrm{d} x}=ae^{ax} \\ &\frac{\mathrm{d} y}{\mathrm{d} x}=ay \end{aligned}

From the given equation, we have

\begin{aligned} &y=e^{ax} \\ &log\, y=ax \\&a=\frac{log\, y}{x} \end{aligned}

Now,

\begin{aligned} &\frac{\mathrm{d} y}{\mathrm{d} x}=ay=y\frac{log\, y}{x} \\ &x\frac{\mathrm{d} y}{\mathrm{d} x}=y\, log\, y\end{aligned}

 The required equation is

x\frac{\mathrm{d} y}{\mathrm{d} x}=y\, log\, y

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Gurleen Kaur

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