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  • Explain Solution R.D.Sharma Class 12 Chapter 21 Differential Equations Exercise Revision Exercise Question 34 Maths Textbook Solution.

Explain Solution R.D.Sharma Class 12 Chapter 21 Differential Equations Exercise Revision Exercise Question 34  Maths Textbook Solution.

Answers (1)

Answer:\left ( x+c \right )e^{x+y}+1=0\

Hint: you must know the rules of solving differential equation and integrations.

Given:\frac{dy}{dx}+1=e^{x+y}

Solution:\frac{dy}{dx}+1=e^{x+y}..........(I)

Put x + y = t and differentiate both sides. We get,

1+\frac{dy}{dx}=\frac{dt}{dx}

Compare with equation (I),

\frac{dt}{dx}=e^{t}

e^{-t}dt=dx

Now, integrating both sides,

\begin{aligned} &\int \mathrm{e}^{-\mathrm{t}} \mathrm{d} \mathrm{t}=\int \mathrm{dx} \quad\left[\because \int \mathrm{e}^{-\mathrm{t}} \mathrm{dt}=\frac{\mathrm{e}^{-\mathrm{t}}}{-1}\right] \\ &-\mathrm{e}^{-\mathrm{t}}=\mathrm{x}+\mathrm{C} \\ &\frac{-1}{\mathrm{e}^{\mathrm{x}+\mathrm{y}}}=\mathrm{x}+\mathrm{C} \\ &(\mathrm{x}+\mathrm{C}) \mathrm{e}^{\mathrm{x}+\mathrm{y}}+1=0 \end{aligned}

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