Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 3 - Exponents, Polynomials and Functions - 3.2 Combining Functions - 3.2 Exercises - Page 247: 67

Answer

$(a)f(x)+g(x)=-3x+17$ $(b)f(x)-g(x)=9x-1$ $(c)f(x)g(x)=-18x^2-21x+72$ $(d)\frac{f(x)}{g(x)}=\frac{3x+8}{-6x+9}$

Work Step by Step

$f(x)=3x+8$ $g(x)=-6x+9$ $(a)f(x)+g(x)=3x+8+(-6x+9)$ $f(x)+g(x)=3x+8-6x+9$ $f(x)+g(x)=3x-6x+8+9$ $f(x)+g(x)=-3x+17$ $(b)f(x)-g(x)=3x+8-(-6x+9)$ $f(x)-g(x)=3x+8+6x-9$ $f(x)-g(x)=3x+6x+8-9$ $f(x)-g(x)=9x-1$ $(c) f(x)g(x)=(3x+8)(-6x+9)$ $ f(x)g(x)=3x(-6x+9)+8(-6x+9)$ $f(x)g(x)=-18x^2+27x-48x+72$ $f(x)g(x)=-18x^2+(27-48)x+72$ $f(x)g(x)=-18x^2-21x+72$ $(d)\frac{f(x)}{g(x)}=\frac{3x+8}{-6x+9}$
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