Sequences

a_n=2n=2,4,6,8,10,12,14,16,18...

A series

(4i - 5) = - 1 + 3 + 7 + 11 + 15 + 19 = 54.

5(k + 2) = 5(k + 2) = 5[6 + 7 + 8 + 9] = 150.

functions

F(x) where x is the variable of one of the numbers within the domain. A domain is a number set. Domain is the input and range is the output (result) of the function.

For example you would have a function that goes like this.

f(x)=2x+20

your domain list would be (this would represent x)

X=1,3,5,7,9,11

Your range (the output) for this functions domain would be

f(1)=22
f(3)=26
f(5)=30
f(7)=34
f(9)=38
f(11)=42

Precalculus assessement

Today I was taking an assessment test and realized something... I did not remember functions! F(X) had no meaning to me and thus was my predicament. I decided that because of this I was going to start this blog and put down information that I would find personally useful later on.