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Still Confused?

Try reviewing these fundamentals first

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Try reviewing these fundamentals first

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Get Started Now- Intro Lesson2:41
- Lesson: 1a12:36
- Lesson: 1b8:00
- Lesson: 2a17:26
- Lesson: 2b19:39
- Lesson: 316:32

In this section, we will learn about another test called the Integral test. The idea is to take the general term as a function in terms of x, and then integrate it. You can only use this test if the function is positively decreasing. If the integral gives a finite value, then the series is convergent. If the integral diverges to infinity, then the series is also divergent. We will first do some questions that require you to use the integral test instead of p-series test. Then we will use the integral test on a complicated series to see if it converges or diverges.

Note *The integral test states the following:

If $f(x)=a_n$ and $f(x)$ is a continuous, positive decreasing function from $[i,\infty]$, then we can say that:

1. If $\int_{i}^{\infty}f(x)dx$ is convergent, then the series $\sum_{n=i}^{\infty}a_n$ is also convergent.

2. If $\int_{i}^{\infty}f(x)dx$ is divergent, then the series $\sum_{n=i}^{\infty}a_n$ is also divergent.

If $f(x)=a_n$ and $f(x)$ is a continuous, positive decreasing function from $[i,\infty]$, then we can say that:

1. If $\int_{i}^{\infty}f(x)dx$ is convergent, then the series $\sum_{n=i}^{\infty}a_n$ is also convergent.

2. If $\int_{i}^{\infty}f(x)dx$ is divergent, then the series $\sum_{n=i}^{\infty}a_n$ is also divergent.

- IntroductionIntegral Test Overview
- 1.
**P Series versus Integral test**

Use the integral test instead of the p-series test to show that the series converge or diverge.a)$\sum_{n=1}^{\infty}\frac{3}{n^2}$b)$\sum_{n=1}^{\infty}\frac{1}{n}$ - 2.
**Convergence/Divergence of Integral Test**

Determine whether the following series converge or diverge using the integral test.a)$\sum_{n=3}^{\infty}\frac{2}{(5n+4)^5}$b)$\sum_{n=1}^{\infty}\frac{1}{n^2+7n+12}$ - 3.
**Advanced Question Regarding to the Integral Test**

Determine if the series $\sum_{k=2}^{\infty}\frac{1}{k\ \ {^3}\sqrt{ln(4k)}}$ converges or diverges.

5.

Sequence and Series

5.1

Introduction to sequences

5.2

Monotonic and bounded sequences

5.3

Introduction to infinite series

5.4

Convergence and divergence of normal infinite series

5.5

Convergence & divergence of geometric series

5.6

Convergence & divergence of telescoping series

5.7

Divergence of harmonic series

5.8

P Series

5.9

Alternating series test

5.10

Divergence test

5.11

Comparison & limit comparison test

5.12

Integral test

5.13

Ratio test

5.14

Root test

5.15

Absolute & conditional convergence

5.16

Radius and interval of convergence with power series

5.17

Functions expressed as power series

5.18

Taylor series and Maclaurin series

5.19

Approximating functions with Taylor polynomials and error bounds

We have over 170 practice questions in Integral Calculus for you to master.

Get Started Now5.1

Introduction to sequences

5.2

Monotonic and bounded sequences

5.4

Convergence and divergence of normal infinite series

5.5

Convergence & divergence of geometric series

5.6

Convergence & divergence of telescoping series

5.7

Divergence of harmonic series

5.8

P Series

5.9

Alternating series test

5.10

Divergence test

5.11

Comparison & limit comparison test

5.12

Integral test

5.13

Ratio test

5.14

Root test

5.15

Absolute & conditional convergence

5.16

Radius and interval of convergence with power series

5.17

Functions expressed as power series

5.18

Taylor series and Maclaurin series