CliffsNotes To Go Sweepstakes -- Enter Now to Win an iPod touch Loaded with Cliffs Study Apps

How hot is Levi Johnston?

Sizzlin'!
Not bad. I've seen better.
He's taking the quick fame thing way too far.

View Results

Algebra of Functions

If two functions have a common domain, then arithmetic can be performed with them using the following definitions.




Example 1: If f ( x) = x + 4 and g( x) = x2 − 2 x − 3, find each of the following and determine the common domain.




The common domain is {all real numbers}.




The common domain is {all real numbers}.




Use the distributive property.




The common domain is {all real numbers}.




This expression is undefined when x = 3 or when x = −1. So the common domain is {all real numbers except 3 or −1}.

Cite this article