Question

HELP what is this sigma notation?
n=4
∑ ( x2+1) =?
n=1

Answer 1

@mathstudent55

Answer 2

@freckles

Answer 3

@iambatman

Answer 4

please help!

Answer 5

@pooja195

Answer 6

@OswinOswald

Answer 7

Not a clue, sorry.

Answer 8

can you have someone else look at it ? @OswinOswald

Answer 9

I don't know anyone who'd know.

Answer 10

@sammixboo

Answer 11

@SolomonZelman please help me!

Answer 12

@CallMeKiki please help less than

Answer 13

http://www.mathsisfun.com/algebra/sigma-notation.html

Answer 14

Sigma is a Greek letter. Capital sigma is used in math to denote a sum.

Answer 15

Here is a simple example.
To show a sum of the integers from 1 to 5, you can write
1 + 2 + 3 + 4 + 5
Using summation notation, it is:

Answer 16

The way to think of it is that the variable under the letter sigma will take on values from 1, i = 1, to 5, the 5 above the sigma.
Not only will the variable i take on the values from 1 to 5, teh letter sigma stands for a sum, so