Functions
FIU has online movies to help with this topic on this page. You must have QuickTime Player, a free download, installed on your computer.
Homework help:
For exercises 15-18, it will be a function unless you have a domain element with 2 or more arrow emanating from it.
For exercises 19-26, it will be a function unless you can find two ordered pairs with the same x-coordinate
For exercises 27-38, it will be a function unless one x can produce two y’s. What can cause this? A ± sign, y inside absolute value, or y raised to an even power.
The University of Idaho provides another online resource. These lectures are only viewable by those with DSL or cable modems. Real Player, a free download, is required to see these videos. The videos cover the topics below. To see the videos, go to this page and look under section 3.1.
Definition of a Function; Evaluating functions
Finding the Domain of
a Function
Operations on Functions
Finding the Domain of Functions with Operators
Joliet
Junior College has online videos as well.
Determine
whether a relation represents a function
Find
the value of a function
Determine
the domain of a function
Form
the sum, difference, product, and quotient of two functions
Other online help:
Functions (PurpleMath site)
Functions
(Cal. State site)
Function
notation