Table of contents

0. Functions7h 52m
1. Limits and Continuity2h 2m
2. Intro to Derivatives1h 33m
3. Techniques of Differentiation3h 18m
4. Applications of Derivatives2h 38m
5. Graphical Applications of Derivatives6h 2m
6. Derivatives of Inverse, Exponential, & Logarithmic Functions2h 37m
7. Antiderivatives & Indefinite Integrals1h 26m
8. Definite Integrals4h 44m
9. Graphical Applications of Integrals2h 27m
- Area Between Curves
  1h 18m
- Introduction to Volume & Disk Method
  1h 8m
10. Physics Applications of Integrals 3h 16m
- Kinematics
  1h 13m
- Work
  2h 3m
11. Integrals of Inverse, Exponential, & Logarithmic Functions2h 34m
12. Techniques of Integration7h 39m
13. Intro to Differential Equations2h 55m
14. Sequences & Series5h 36m
15. Power Series2h 19m
- Introduction to Power Series
  1h 9m
- Taylor Series & Taylor Polynomials
  1h 10m
16. Parametric Equations & Polar Coordinates7h 58m

13. Intro to Differential Equations

Basics of Differential Equations

Calculus

13. Intro to Differential Equations

Basics of Differential Equations

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Multiple Choice

Which of the following functions is a solution to the differential equation $4 y + y^{″} = 0$ ?

y = x^{2}

y = tan x

y = \frac{1}{x}

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

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Verified step by step guidance

Step 1: Understand the problem. The goal is to determine which function satisfies the given differential equation 4y + y'' = 0. This involves substituting each function into the equation and verifying if it holds true.

Step 2: Recall the definitions. The differential equation involves the second derivative of the function (y''), so for each candidate function, compute y'' and substitute it into the equation along with the original function y.

Step 3: Start with the first candidate function y = x^2. Compute its second derivative: y'' = 2. Substitute y = x^2 and y'' = 2 into the equation 4y + y'' = 0 and check if the equation is satisfied.

Step 4: Repeat the process for the second candidate function y = an x. Compute its second derivative (y''), substitute y and y'' into the equation, and verify if it satisfies 4y + y'' = 0.

Step 5: Finally, test the given correct answer y = e^{x/2}. Compute its second derivative: y'' = (1/4)e^{x/2}. Substitute y = e^{x/2} and y'' = (1/4)e^{x/2} into the equation 4y + y'' = 0 and confirm that it satisfies the equation.