Mister Exam
Other calculators
- Taylor Series Step by Step
- Fourier series step by step
- Differential equations Step by Step
- Product of series
-
How to use it?
- Sum of series:
-
sin1/n
-
28
-
0.5^n
-
((n+1)^n*3^(2n-1))/(2n+1)!
- Derivative of:
-
x(x+1)
- Graphing y =:
- x(x+1)
- Integral of d{x}:
-
x(x+1)
-
Identical expressions
- x(x+ one)
- x(x plus 1)
- x(x plus one)
- xx+1
-
Similar expressions
- 1/((x)(x+1)(x+2))
- 1/(x*(x+1))
- x(x-1)
- 1/(x*(x+1)*(x+2))
Sum of series x(x+1)
The solution
You have entered
[src]
oo __ \ ` ) x*(x + 1) /_, n = 1
$$\sum_{n=1}^{\infty} x \left(x + 1\right)$$
Sum(x*(x + 1), (n, 1, oo))
The radius of convergence of the power series
Given number:
$$x \left(x + 1\right)$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = x \left(x + 1\right)$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} 1$$
Let's take the limit
we find
$$x \left(x + 1\right)$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = x \left(x + 1\right)$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} 1$$
Let's take the limit
we find
True
False
Examples of finding the sum of a series
- The Sum of the Power Series
x^n/n
(x-1)^n
- Factorial
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
- Flint Hills Series
csc(n)^2/n^3
- Basel problem
1/n^2
1/n^4
1/n^6
- Harmonic series
1/n
- Grandi's series
(-1)^n
- Alternating series
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
- Newton–Mercator series
(-1)^(n + 1)/n*x^n
- Exam the series for convergence
(3*n - 1)/(-5)^n