professor-curious-logo
professor-curious-logo
  1. AP Calculus
FlashcardFlashcard
Study GuideStudy GuideQuestion BankQuestion BankGlossaryGlossary

Define Riemann Sum.

Approximation of the area under a curve by dividing it into rectangles.

Flip to see [answer/question]
Flip to see [answer/question]
Revise later
SpaceTo flip
If confident

All Flashcards

Define Riemann Sum.

Approximation of the area under a curve by dividing it into rectangles.

What is Summation Notation?

A concise way to represent the sum of a sequence of numbers.

Define Definite Integral.

The exact area under a curve between two specified limits.

What is Δx\Delta xΔx in Riemann Sums?

The width of each subinterval in the Riemann Sum approximation.

What is xix_ixi​ in Riemann Sums?

The x-value used to determine the height of the rectangle in the Riemann Sum.

Define Left Riemann Sum.

A Riemann sum where the height of each rectangle is determined by the function value at the left endpoint of the subinterval.

Define Right Riemann Sum.

A Riemann sum where the height of each rectangle is determined by the function value at the right endpoint of the subinterval.

What is the role of nnn in Riemann Sums?

Represents the number of subintervals used in the approximation.

What does aaa represent in a definite integral ∫abf(x)dx\int_a^b f(x) dx∫ab​f(x)dx?

The lower limit of integration.

What does bbb represent in a definite integral ∫abf(x)dx\int_a^b f(x) dx∫ab​f(x)dx?

The upper limit of integration.

Formula for Δx\Delta xΔx?

Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​

Formula for xix_ixi​ (right endpoint)?

xi=a+Δxcdotix_i = a + \Delta x cdot ixi​=a+Δxcdoti

General form of Left Riemann Sum?

∑i=0n−1Δxcdotf(xi)\sum_{i=0}^{n-1} {\Delta x}cdot{f({x_i})}∑i=0n−1​Δxcdotf(xi​)

General form of Right Riemann Sum?

∑i=1nΔxcdotf(xi)\sum_{i=1}^{n} {\Delta x}cdot{f({x_i})}∑i=1n​Δxcdotf(xi​)

Definite Integral as Limit of Riemann Sum?

lim⁡n→∞∑i=1nΔxcdotf(xi)=∫abf(x)dx\lim_{n\to \infty}\sum_{i=1}^{n} {\Delta x}cdot{f({x_i})}=\int_a^bf(x) dxlimn→∞​∑i=1n​Δxcdotf(xi​)=∫ab​f(x)dx

Area of i-th rectangle A(i) in Riemann sum?

A(i)=Δx∗f(xi)A(i) = \Delta x * f(x_i)A(i)=Δx∗f(xi​)

Formula for f(xi)f(x_i)f(xi​)?

Substitute xix_ixi​ into the original function f(x)f(x)f(x).

What is the formula for the area under the curve of f(x)?

∫abf(x)dx\int_a^b f(x) dx∫ab​f(x)dx

How to express a limit of a Riemann sum as a definite integral?

lim⁡n→∞∑i=1nf(xi)Δx=∫abf(x)dx\lim_{n \to \infty} \sum_{i=1}^n f(x_i) \Delta x = \int_a^b f(x) dxlimn→∞​∑i=1n​f(xi​)Δx=∫ab​f(x)dx

What is the formula for expressing the definite integral as the limit of a Riemann sum?

∫abf(x)dx=lim⁡n→∞∑i=1nf(a+iΔx)Δx\int_a^b f(x) dx = \lim_{n \to \infty} \sum_{i=1}^n f(a + i\Delta x) \Delta x∫ab​f(x)dx=limn→∞​∑i=1n​f(a+iΔx)Δx, where Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​

How to find Δx\Delta xΔx given interval [a,b] and n?

Calculate Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​.

How to find xix_ixi​ for right Riemann sum?

Use the formula xi=a+iΔxx_i = a + i\Delta xxi​=a+iΔx.

Steps to convert Riemann sum to definite integral?

  1. Identify a, b, and f(x). 2. Express the limit of the Riemann sum in the form ∫abf(x)dx\int_a^b f(x) dx∫ab​f(x)dx.

How do you evaluate a Riemann sum with given function, interval, and n?

  1. Find Δx\Delta xΔx. 2. Find xix_ixi​. 3. Evaluate f(xi)f(x_i)f(xi​). 4. Compute ∑i=1nf(xi)Δx\sum_{i=1}^n f(x_i) \Delta x∑i=1n​f(xi​)Δx.

How to express a definite integral as the limit of a Riemann sum?

  1. Find Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​. 2. Find xi=a+iΔxx_i = a + i\Delta xxi​=a+iΔx. 3. Substitute xix_ixi​ into f(x)f(x)f(x). 4. Write the limit: lim⁡n→∞∑i=1nf(xi)Δx\lim_{n \to \infty} \sum_{i=1}^n f(x_i) \Delta xlimn→∞​∑i=1n​f(xi​)Δx.

How to find the summation notation for a right Riemann sum?

  1. Determine Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​. 2. Find xi=a+iΔxx_i = a + i\Delta xxi​=a+iΔx. 3. Evaluate f(xi)f(x_i)f(xi​). 4. Write the sum: ∑i=1nf(xi)Δx\sum_{i=1}^n f(x_i) \Delta x∑i=1n​f(xi​)Δx.

How to calculate the value of a Riemann sum with 10 subintervals?

  1. Calculate Δx\Delta xΔx. 2. Find xix_ixi​ for each subinterval. 3. Evaluate f(xi)f(x_i)f(xi​) for each xix_ixi​. 4. Sum the areas: ∑i=110f(xi)Δx\sum_{i=1}^{10} f(x_i) \Delta x∑i=110​f(xi​)Δx.

How to define Δx\Delta xΔx in terms of nnn when expressing a definite integral as a Riemann sum?

Use the formula Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​, where aaa and bbb are the limits of integration.

How to define xix_ixi​ in terms of nnn for a right Riemann sum?

Use the formula xi=a+iΔx=a+ib−anx_i = a + i\Delta x = a + i\frac{b-a}{n}xi​=a+iΔx=a+inb−a​, where aaa is the lower limit of integration.

How to express the definite integral as the limit of a right Riemann sum?

  1. Find Δx=b−an\Delta x = \frac{b-a}{n}Δx=nb−a​. 2. Find xi=a+iΔxx_i = a + i\Delta xxi​=a+iΔx. 3. Substitute xix_ixi​ into f(x)f(x)f(x). 4. Write the limit: lim⁡n→∞∑i=1nf(xi)Δx\lim_{n \to \infty} \sum_{i=1}^n f(x_i) \Delta xlimn→∞​∑i=1n​f(xi​)Δx.