Given the graph of below, evaluate the definite integral .
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- 0. Functions7h 55m
- Introduction to Functions18m
- Piecewise Functions10m
- Properties of Functions9m
- Common Functions1h 8m
- Transformations5m
- Combining Functions27m
- Exponent rules32m
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- Introduction to Trigonometric Functions38m
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- 1. Limits and Continuity2h 2m
- 2. Intro to Derivatives1h 33m
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- 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
- 10. Physics Applications of Integrals 3h 16m
- 11. Integrals of Inverse, Exponential, & Logarithmic Functions2h 31m
- 12. Techniques of Integration7h 41m
- 13. Intro to Differential Equations2h 55m
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- 16. Parametric Equations & Polar Coordinates7h 58m
8. Definite Integrals
Introduction to Definite Integrals
Multiple Choice
Find the exact length of the curve for .
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Verified step by step guidance1
Step 1: Recall the formula for the arc length of a curve y = f(x) over an interval [a, b]. The formula is given by: L = ∫[a, b] √(1 + (dy/dx)^2) dx. Here, we need to compute the derivative of y = (1/4)x^2 - (1/2)ln(x) with respect to x.
Step 2: Compute dy/dx. Differentiate y = (1/4)x^2 - (1/2)ln(x) term by term. The derivative of (1/4)x^2 is (1/2)x, and the derivative of -(1/2)ln(x) is -(1/2)(1/x). Thus, dy/dx = (1/2)x - (1/2)(1/x).
Step 3: Square the derivative dy/dx to find (dy/dx)^2. Substitute dy/dx = (1/2)x - (1/2)(1/x) into (dy/dx)^2. Expand and simplify: (dy/dx)^2 = [(1/2)x - (1/2)(1/x)]^2 = (1/4)x^2 - (1/2) + (1/4)(1/x^2).
Step 4: Add 1 to (dy/dx)^2 to compute the integrand for the arc length formula. Substitute (dy/dx)^2 = (1/4)x^2 - (1/2) + (1/4)(1/x^2) into 1 + (dy/dx)^2. Simplify: 1 + (dy/dx)^2 = 1 + (1/4)x^2 - (1/2) + (1/4)(1/x^2) = (1/4)x^2 + (1/2) + (1/4)(1/x^2).
Step 5: Set up the integral for the arc length. Substitute √(1 + (dy/dx)^2) = √[(1/4)x^2 + (1/2) + (1/4)(1/x^2)] into the arc length formula: L = ∫[1, 2] √[(1/4)x^2 + (1/2) + (1/4)(1/x^2)] dx. Evaluate this integral carefully to find the exact length of the curve.
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