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

Solve the differential equation by separation of variables: $\frac{d y}{d x} = \frac{2 y + 7}{8 x + 9}$ . Which of the following is the general solution?

8 y + 28 = 2 x + 9 + C

8 y + 28 = 2 \ln | 8 x + 9 | + C

2 y + 7 = \ln | 8 x + 9 | + C

2 y + 7 = 8 x + 9 + C

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Verified step by step guidance

Step 1: Start by identifying that the differential equation can be solved using the method of separation of variables. The equation is given as $ \frac{dy}{dx} = \frac{2y + 7}{8x + 9} $. Rewrite it to separate the variables $ y $ and $ x $.

Step 2: Rearrange the equation to isolate $ y $ terms on one side and $ x $ terms on the other. Multiply both sides by $ 8x + 9 $ and divide by $ 2y + 7 $, resulting in $ \frac{dy}{2y + 7} = \frac{dx}{8x + 9} $.

Step 3: Integrate both sides of the equation. For the left-hand side, integrate $ \int \frac{1}{2y + 7} \, dy $, and for the right-hand side, integrate $ \int \frac{1}{8x + 9} \, dx $. Use substitution if necessary to simplify the integrals.

Step 4: Solve the integrals. The left-hand side becomes $ \frac{1}{2} \ln|2y + 7| $, and the right-hand side becomes $ \frac{1}{8} \ln|8x + 9| $. Combine the results and include the constant of integration $ C $.

Step 5: Multiply through by constants to simplify the expression into the general solution form. After simplification, the general solution is $ 8y + 28 = 2 \ln|8x + 9| + C $.