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AP Calculus BC Flashcards: Initial Conditions And Separation Of Variables

Study Initial Conditions And Separation Of Variables in AP Calculus BC with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

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What this deck covers

This deck focuses on Initial Conditions And Separation Of Variables, giving you a quick way to review the definitions, rules, and examples that matter most for AP Calculus BC.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

AP Calculus BC Flashcards: Initial Conditions And Separation Of Variables

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QUESTION

What equation results from integrating dyy=1xdx\frac{dy}{y} = \frac{1}{x} dxydy​=x1​dx?

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ANSWER

ln⁡∣y∣=ln⁡∣x∣+C\ln |y| = \ln |x| + Cln∣y∣=ln∣x∣+C. Standard result from integrating separated variables.

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Flashcard 1: What equation results from integrating dyy=1xdx\frac{dy}{y} = \frac{1}{x} dxydy​=x1​dx?

Answer: ln⁡∣y∣=ln⁡∣x∣+C\ln |y| = \ln |x| + Cln∣y∣=ln∣x∣+C. Standard result from integrating separated variables.

Flashcard 2: Convert dydx=x2y3\frac{dy}{dx} = x^2y^3dxdy​=x2y3 into a separable form.

Answer: dyy3=x2dx\frac{dy}{y^3} = x^2 dxy3dy​=x2dx. Move y3y^3y3 to the left side and x2x^2x2 to the right.

Flashcard 3: Find the particular solution of dydx=2x\frac{dy}{dx} = 2xdxdy​=2x with y(0)=4y(0) = 4y(0)=4.

Answer: y=x2+4y = x^2 + 4y=x2+4. Integrate to get y=x2+Cy = x^2 + Cy=x2+C, then use initial condition.

Flashcard 4: What is the particular solution for dydx=−3y\frac{dy}{dx} = -3ydxdy​=−3y with y(2)=1y(2) = 1y(2)=1?

Answer: y=e−3x+6y = e^{-3x + 6}y=e−3x+6. From y=Ce−3xy = Ce^{-3x}y=Ce−3x, use y(2)=1y(2) = 1y(2)=1 to find C=e6C = e^6C=e6.

Flashcard 5: What is the role of the integration constant CCC in differential equations?

Answer: Represents the family of solutions. Each value of CCC gives a different particular solution.

Flashcard 6: What is the general solution of dydx=1\frac{dy}{dx} = 1dxdy​=1?

Answer: y=x+Cy = x + Cy=x+C. Direct integration of a constant function.

Flashcard 7: Determine CCC for the particular solution of dydx=5y\frac{dy}{dx} = 5ydxdy​=5y with y(0)=7y(0) = 7y(0)=7.

Answer: C=7C = 7C=7. From y=Ce5xy = Ce^{5x}y=Ce5x with y(0)=7y(0) = 7y(0)=7, so C=7C = 7C=7.

Flashcard 8: Solve dydx=x3y2\frac{dy}{dx} = x^3y^2dxdy​=x3y2 by separating variables.

Answer: dyy2=x3dx\frac{dy}{y^2} = x^3 dxy2dy​=x3dx. Move y2y^2y2 to left side and x3x^3x3 to right side.

Flashcard 9: Given dydx=3x2\frac{dy}{dx} = 3x^2dxdy​=3x2, what is the particular solution with y(0)=2y(0) = 2y(0)=2?

Answer: y=x3+2y = x^3 + 2y=x3+2. Integrate to get y=x3+Cy = x^3 + Cy=x3+C, then use y(0)=2y(0) = 2y(0)=2 to find C=2C = 2C=2.

Flashcard 10: State the integration result of dyy=1xdx\frac{dy}{y} = \frac{1}{x} dxydy​=x1​dx.

Answer: ln∣y∣=ln∣x∣+C\text{ln}|y| = \text{ln}|x| + Cln∣y∣=ln∣x∣+C. Direct integration of the separated variables.

Flashcard 11: What is the general solution for dydx=−y\frac{dy}{dx} = -ydxdy​=−y?

Answer: y=Ce−xy = Ce^{-x}y=Ce−x. Standard exponential decay with rate 111.

Flashcard 12: What is the role of CCC in the solution y=Cekxy = Ce^{kx}y=Cekx?

Answer: Constant for initial conditions. Determines the specific solution from the family of solutions.

Flashcard 13: Given dydx=4x\frac{dy}{dx} = 4xdxdy​=4x, find CCC if y(1)=6y(1) = 6y(1)=6.

Answer: C=4C = 4C=4. From y=2x2+Cy = 2x^2 + Cy=2x2+C with y(1)=6y(1) = 6y(1)=6, so C=4C = 4C=4.

Flashcard 14: Solve dydx=yx\frac{dy}{dx} = \frac{y}{x}dxdy​=xy​ for yyy using separation of variables.

Answer: y=Cxy = Cxy=Cx. Separate to dyy=dxx\frac{dy}{y} = \frac{dx}{x}ydy​=xdx​ and integrate both sides.

Flashcard 15: What is the particular solution for dydx=2y\frac{dy}{dx} = 2ydxdy​=2y with y(0)=3y(0) = 3y(0)=3?

Answer: y=3e2xy = 3e^{2x}y=3e2x. From y=Ce2xy = Ce^{2x}y=Ce2x with condition y(0)=3y(0) = 3y(0)=3 giving C=3C = 3C=3.

Flashcard 16: Determine the particular solution of dydx=y\frac{dy}{dx} = ydxdy​=y with y(0)=5y(0) = 5y(0)=5.

Answer: y=5exy = 5e^xy=5ex. From general solution y=Cexy = Ce^xy=Cex, use condition to find C=5C = 5C=5.

Flashcard 17: What is the general solution to dydx=−ky\frac{dy}{dx} = -kydxdy​=−ky?

Answer: y=Ce−kxy = Ce^{-kx}y=Ce−kx. Standard exponential decay solution with rate kkk.

Flashcard 18: What is the general solution for dydx=x2\frac{dy}{dx} = x^2dxdy​=x2?

Answer: y=x33+Cy = \frac{x^3}{3} + Cy=3x3​+C. Direct integration of the polynomial function.

Flashcard 19: Find the particular solution for dydx=3x2\frac{dy}{dx} = 3x^2dxdy​=3x2 with y(0)=1y(0) = 1y(0)=1.

Answer: y=x3+1y = x^3 + 1y=x3+1. Integrate 3x23x^23x2 and apply the initial condition at x=0x = 0x=0.

Flashcard 20: What is the solution to dydx=0\frac{dy}{dx} = 0dxdy​=0?

Answer: y=Cy = Cy=C. When the derivative is zero, the function is constant.

Flashcard 21: Solve dydx=−2xy\frac{dy}{dx} = -2xydxdy​=−2xy for yyy using separation of variables.

Answer: y=Ce−x2y = Ce^{-x^2}y=Ce−x2. Separate to dyy=−2x dx\frac{dy}{y} = -2x \, dxydy​=−2xdx and integrate both sides.

Flashcard 22: Given y=Cex2y = Ce^{x^2}y=Cex2, find CCC if y(0)=1y(0) = 1y(0)=1.

Answer: C=1C = 1C=1. Substitute x=0x = 0x=0 and y=1y = 1y=1 into the general solution.

Flashcard 23: Find the particular solution to dydx=2yx\frac{dy}{dx} = \frac{2y}{x}dxdy​=x2y​ with y(1)=3y(1) = 3y(1)=3.

Answer: y=3x2y = 3x^2y=3x2. Separate to dyy=2dxx\frac{dy}{y} = \frac{2dx}{x}ydy​=x2dx​, integrate to get y=Cx2y = Cx^2y=Cx2.

Flashcard 24: Solve for yyy given dydx=x\frac{dy}{dx} = xdxdy​=x with initial condition y(1)=3y(1) = 3y(1)=3.

Answer: y=x22+52y = \frac{x^2}{2} + \frac{5}{2}y=2x2​+25​. Integrate ∫x dx=x22+C\int x \, dx = \frac{x^2}{2} + C∫xdx=2x2​+C and apply condition.

Flashcard 25: What is the purpose of using initial conditions in solving differential equations?

Answer: To find particular solutions. They eliminate the arbitrary constant CCC from general solutions.

Flashcard 26: Given dydx=2y\frac{dy}{dx} = 2ydxdy​=2y, find the particular solution with y(0)=1y(0) = 1y(0)=1.

Answer: y=e2xy = e^{2x}y=e2x. From y=Ce2xy = Ce^{2x}y=Ce2x with initial condition y(0)=1y(0) = 1y(0)=1.

Flashcard 27: What is the general solution to dydx=ky\frac{dy}{dx} = kydxdy​=ky using separation of variables?

Answer: y=Cekxy = Ce^{kx}y=Cekx. Standard form for exponential growth/decay differential equations.

Flashcard 28: How do you integrate y′=dydx=x2yy' = \frac{dy}{dx} = x^2 yy′=dxdy​=x2y using separation of variables?

Answer: dyy=x2dx\frac{dy}{y} = x^2 dxydy​=x2dx. Divide both sides by yyy and multiply by dxdxdx.

Flashcard 29: What is the first step in solving a differential equation using separation of variables?

Answer: Separate the variables. This allows variables to be on different sides for integration.

Flashcard 30: What is the solution to dydx=4y\frac{dy}{dx} = 4ydxdy​=4y using separation of variables?

Answer: y=Ce4xy = Ce^{4x}y=Ce4x. Standard exponential solution with growth rate k=4k = 4k=4.