Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 2 - Linear and Quadratic Functions - Cumulative Review - Page 188: 8

Answer

(a) $ -3$, (b) $ x^2-4x-2$, (c) $ x^2+4x+1$, (d) $ -x^2+4x-1$, (e) $ x^2-3$, (f) $ 2x+h-4$.

Work Step by Step

Given $f(x)=x^2-4x+1$, we have: (a) $f(2)=(2)^2-4(2)+1=-3$, (b) $f(x)+f(2)=x^2-4x+1-3=x^2-4x-2$, (c) $f(-x)=(-x)^2-4(-x)+1=x^2+4x+1$, (d) $-f(x)=-x^2+4x-1$, (e) $f(x+2)=(x+2)^2-4(x+2)+1=x^2-3$, (f) $\frac{f(x+h)-f(x)}{h}=\frac{(x+h)^2-4(x+h)+1-(x^2-4x+1)}{h}=\frac{2xh+h^2-4h}{h}=2x+h-4$.
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