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Area by geometry Use geometry to evaluate the following definite integrals, where the graph of ƒ is given in the figure.
(b) ∫₆⁴ ƒ(𝓍) d𝓍
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Ch. 5 - Integration
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243
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TOC.tableOfContents
- Ch. 1 - Functions210
- Ch. 2 - Limits371
- Ch. 3 - Derivatives633
- Ch. 4 - Applications of the Derivative412
- Ch. 5 - Integration328
- Ch. 6 - Applications of Integration331
- Ch. 7 - Logarithmic, Exponential Functions, and Hyperbolic Functions177
- Ch. 8 - Integration Techniques394
- Ch. 9 - Differential Equations179
- Ch. 10 - Sequences and Infinite Series339
- Ch. 11 - Power Series218
- Ch.12 - Parametric and Polar Curves215
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Capitolo 5, Problema 5.R.13
Limit definition of the definite integral Use the limit definition of the definite integral with right Riemann sums and a regular partition to evaluate the following definite integrals. Use the Fundamental Theorem of Calculus to check your answer.
∫₀⁴ (𝓍³―𝓍) d𝓍
Guida verificata passo dopo passo1
Step 1: Recall the limit definition of the definite integral. The definite integral ∫ₐᵇ f(𝓍) d𝓍 can be approximated using right Riemann sums with a regular partition. Divide the interval [a, b] into n subintervals of equal width Δ𝓍 = (b - a)/n.
Step 2: For the given integral ∫₀⁴ (𝓍³ - 𝓍) d𝓍, the interval [0, 4] is divided into n subintervals. The width of each subinterval is Δ𝓍 = (4 - 0)/n = 4/n.
Step 3: The right endpoints of the subintervals are given by 𝓍ᵢ = a + iΔ𝓍 = 0 + i(4/n) = (4i)/n, where i ranges from 1 to n.
Step 4: Substitute the function f(𝓍) = 𝓍³ - 𝓍 into the Riemann sum formula. The sum becomes Sₙ = Σᵢ₌₁ⁿ f(𝓍ᵢ)Δ𝓍 = Σᵢ₌₁ⁿ [(𝓍ᵢ³ - 𝓍ᵢ) * Δ𝓍]. Replace 𝓍ᵢ with (4i)/n and Δ𝓍 with 4/n.
Step 5: Simplify the expression for Sₙ: Sₙ = Σᵢ₌₁ⁿ [((4i)/n)³ - (4i)/n] * (4/n). Expand and simplify the terms inside the summation. Then, take the limit as n → ∞ to compute the exact value of the integral. Finally, use the Fundamental Theorem of Calculus to verify the result by directly evaluating ∫₀⁴ (𝓍³ - 𝓍) d𝓍.
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Definite Integral
A definite integral represents the signed area under a curve defined by a function over a specific interval. It is calculated as the limit of Riemann sums, which approximate the area by dividing the interval into smaller subintervals and summing the areas of rectangles formed. The notation ∫ₐᵇ f(x) dx indicates the integral of f(x) from a to b.
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Definition of the Definite Integral
Riemann Sums
Riemann sums are a method for approximating the value of a definite integral by dividing the area under a curve into rectangles. The height of each rectangle is determined by the function's value at specific points within each subinterval, such as the right endpoint, left endpoint, or midpoint. As the number of rectangles increases (and their width decreases), the Riemann sum approaches the exact value of the definite integral.
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06:11Introduction to Riemann Sums
Fundamental Theorem of Calculus
The Fundamental Theorem of Calculus links differentiation and integration, stating that if F is an antiderivative of f on an interval [a, b], then the definite integral of f from a to b can be computed as F(b) - F(a). This theorem provides a powerful way to evaluate definite integrals by finding an antiderivative rather than relying solely on Riemann sums.
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