VIT - VITEEE 2025
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Bernoulli’s Equation is considered one the most difficult concept.
17 Questions around this concept.
Which of the following is Bernoulli's equation?
The integrating factor of the differential equation $(xy-1)\frac{dy}{dx}+y^{2}=0$ is
A curve passes through the point $(0,1)$ and the gradient at $(x,y)$ on it is $y(xy-1)$. The equation of the curve is
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Integrating factor of $\frac{x d y}{d x}-y=x^4-3 x$ is:
When DE is not in the linear form, it can sometimes be converted into a linear form with the help of proper substitution.
An equation of the form
$
\frac{\mathrm{dy}}{\mathrm{dx}}+\mathrm{P}(\mathrm{x}) \cdot \mathrm{y}=\mathrm{Q}(\mathrm{x}) \cdot \mathrm{y}^{\mathrm{n}}
$
Where $\mathrm{P}(\mathrm{x})$ and $\mathrm{Q}(\mathrm{x})$ are a function of x only, is known as Bernoulli's equation.
(If we put $\mathrm{n}=0$, then the equation is in linear form.)
To reduce Eq (i) into linear form, divide both sides by $\mathrm{y}^{\mathrm{n}}$,
$
\begin{gathered}
\frac{1}{y^n} \cdot \frac{d y}{d x}+\frac{P(x)}{y^{n-1}}=Q(x) \\
\text { or } \quad y^{-n} \cdot \frac{d y}{d x}+y^{1-n} \cdot P(x)=Q(x)
\end{gathered}
$
Putting $y^{1-n}=t$, converts this equation into a linear equation in $t$, which can then be solved
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