Separation of Variables (AQA A-Level Mathematics): Quizzes

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Separation of Variables
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When does separation of variables work for solving differential equations?

When all yy terms can go on one side

What is the general form for a separable first-order differential equation?

dydx=g(x)h(y)\frac{dy}{dx} = g(x)h(y)

After separating variables, what form should the equation take?

1h(y) dy=g(x) dx\frac{1}{h(y)} \, dy = g(x) \, dx

What must always be included when integrating both sides?

The constant of integration CC

For dydx=xy\frac{dy}{dx} = xy, what is the correct separated form?

1y dy=x dx\frac{1}{y} \, dy = x \, dx

After integrating dydx=xy\frac{dy}{dx} = xy to get ln⁡∣y∣=x22+C\ln |y| = \frac{x^2}{2} + C, what is the next step?

Exponentiate both sides

What is the general solution to dydx=xy\frac{dy}{dx} = xy?

y=C1ex22y = C_1 e^{\frac{x^2}{2}}

For dydx=xy+1\frac{dy}{dx} = \frac{x}{y + 1}, what is the separated form?

(y+1) dy=x dx(y + 1) \, dy = x \, dx

What is meant by the implicit form of a solution?

Solution not solved explicitly for yy

Which applications commonly use separation of variables?

Growth and decay, motion, fluid flow

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