Here, we show you a step-by-step solved example of homogeneous differential equation. This solution was automatically generated by our smart calculator:
We can identify that the differential equation $\frac{dy}{dx}=\frac{x^2+y^2}{xy}$ is homogeneous, since it is written in the standard form $\frac{dy}{dx}=\frac{M(x,y)}{N(x,y)}$, where $M(x,y)$ and $N(x,y)$ are the partial derivatives of a two-variable function $f(x,y)$ and both are homogeneous functions of the same degree
Use the substitution: $y=ux$
When multiplying two powers that have the same base ($x$), you can add the exponents
The power of a product is equal to the product of it's factors raised to the same power
Factor the polynomial $x^2+u^2x^2$ by it's greatest common factor (GCF): $x^2$
Simplify the fraction
Expand the fraction $\frac{u\cdot dx+x\cdot du}{dx}$ into $2$ simpler fractions with common denominator $dx$
Simplify the resulting fractions
We need to isolate the dependent variable $u$, we can do that by simultaneously subtracting $u$ from both sides of the equation
Combine all terms into a single fraction with $u$ as common denominator
Cancel like terms $u^2$ and $-u^2$
Group the terms of the differential equation. Move the terms of the $u$ variable to the left side, and the terms of the $x$ variable to the right side of the equality
Expand and simplify
Integrate both sides of the differential equation, the left side with respect to $u$, and the right side with respect to $x$
Applying the power rule for integration, $\displaystyle\int x^n dx=\frac{x^{n+1}}{n+1}$, where $n$ represents a number or constant function, in this case $n=1$
Solve the integral $\int udu$ and replace the result in the differential equation
The integral of the inverse of the lineal function is given by the following formula, $\displaystyle\int\frac{1}{x}dx=\ln(x)$
As the integral that we are solving is an indefinite integral, when we finish integrating we must add the constant of integration $C$
Solve the integral $\int\frac{1}{x}dx$ and replace the result in the differential equation
Replace $u$ with the value $\frac{y}{x}$
The power of a quotient is equal to the quotient of the power of the numerator and denominator: $\displaystyle\left(\frac{a}{b}\right)^n=\frac{a^n}{b^n}$
Multiplying fractions $\frac{1}{2} \times \frac{y^2}{x^2}$
Multiplying fractions $\frac{1}{2} \times \frac{y^2}{x^2}$
Multiply both sides of the equation by $2x^2$
Removing the variable's exponent
Cancel exponents $2$ and $1$
As in the equation we have the sign $\pm$, this produces two identical equations that differ in the sign of the term $\sqrt{2\left(\ln\left(x\right)+C_0\right)x^2}$. We write and solve both equations, one taking the positive sign, and the other taking the negative sign
Combining all solutions, the $2$ solutions of the equation are
Find the explicit solution to the differential equation. We need to isolate the variable $y$
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