Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 7 - Section 7.1 - Radical Expressions and Functions - Exercise Set - Page 511: 22

Answer

$f(28)=5$ $f(4)=1$ $f(3)=0$ $f(-1)=$ Not a real number.

Work Step by Step

The given function is $f(x)=\sqrt{x−3}$ Plug x=28 into the function. $f(28)=\sqrt{28−3}$ Simplify. $f(28)=\sqrt{25}$ $f(28)=\sqrt{5^2}$ $f(28)=5$ Plug x=4 into the function. $f(4)=\sqrt{4−3}$ Simplify. $f(4)=\sqrt{1}$ $f(4)=\sqrt{1^2}$ $f(4)=1$ Plug x=3 into the function. $f(3)=\sqrt{3−3}$ Simplify. $f(3)=\sqrt{0}$ $f(3)=0$ Plug x=-1 into the function. $f(-1)=\sqrt{-1-3}$ Simplify. $f(-1)=\sqrt{-4}$ Not a real number.
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