## Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole

# Chapter 2 - Section 2.1 - Functions - Exercises - Page 155: 3

#### Answer

A) $f(x)=x^2-3x$ B) $10$

#### Work Step by Step

A) The other two functions would not work with plugging in five. The second one would be undetermined, the third would result in a negative under the radical. B) Plug in five and solve from there. 25 minus 15 is 10.

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