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Intermediate Algebra – Student Workbook – Second Edition 2013

Intermediate Algebra – Student Workbook – Second Edition 2013

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Lesson 2b <strong>–</strong> Functions and Function Operations<br />

Mini-Lesson<br />

Function Multiplication and the Multiplication Property of Exponents<br />

When multiplying functions, you will often need to work with exponents of different powers.<br />

The following should be familiar to you and will come into play in the examples below:<br />

MULTIPLICATION PROPERTY OF EXPONENTS<br />

Let m and n be rational numbers.<br />

To multiply powers of the same base, keep the base and add the exponents:<br />

Problem 6 WORKED EXAMPLE <strong>–</strong> FUNCTION MULTIPLICATION<br />

a) Given f(x) = 3x + 2 and g(x) = 2x <strong>–</strong> 5, find ( ) ( )<br />

( ) ( ) ( )( )<br />

( )( ) ( )( ) ( )( ) ( )( )<br />

Now use FOIL<br />

Remember the rules of exp.<br />

( )( ) ( )( )( )( )<br />

( ) ( )<br />

( ) ( ) ( ) ( )<br />

Combine Like Terms<br />

Final Result<br />

b) Given f(x) = 5 and g(x) = (x+3) 0 , find ( ) ( )<br />

( ) ( ) ( )[( ) ]<br />

( )( )<br />

( ) ( )<br />

Remember that<br />

Final Result<br />

c) Given ( ) and ( ) , find ( ) ( )<br />

( ) ( ) ( )( )<br />

( )( )( )( )<br />

( )( )<br />

( ) ( )<br />

Reorder using Commutative Property<br />

Simplify using the Multiplication Property of Exponents<br />

Final Results<br />

Scottsdale Community College Page 79 <strong>Intermediate</strong> <strong>Algebra</strong>

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