Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 12 - Section 12.1 - The Algebra of Functions - Exercise Set: 3

Answer

$a)$ $(f+g)(x)=x^{2}+5x+1$ $b)$ $(f-g)(x)=x^{2}-5x+1$ $c)$ $(f\cdot g)(x)=5x^{3}+5x$ $d)$ $\Big(\dfrac{f}{g}\Big)(x)=\dfrac{x^{2}+1}{5x}$, where $x\ne0$

Work Step by Step

$f(x)=x^{2}+1;$ $g(x)=5x$ For each case, replace $f(x)$ by $x^{2}+1$ and $g(x)$ by $5x$ and simplify if possible $a)$ $(f+g)(x)$ $f(x)+g(x)=(x^{2}+1)+(5x)=x^{2}+1+5x=x^{2}+5x+1$ $b)$ $(f-g)(x)$ $f(x)-g(x)=(x^{2}+1)-(5x)=x^{2}+1-5x=x^{2}-5x+1$ $c)$ $(f\cdot g)(x)$ $f(x)\cdot g(x)=(x^{2}+1)(5x)=5x^{3}+5x$ $d)$ $\Big(\dfrac{f}{g}\Big)(x)$ $\dfrac{f(x)}{g(x)}=\dfrac{x^{2}+1}{5x}$, where $x\ne0$
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