University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 2 - Section 2.2 - Limit of a Function and Limit Laws - Exercises - Page 68: 79

Answer

$$\lim_{x\to4}f(x)=7$$

Work Step by Step

$$\lim_{x\to4}\frac{f(x)-5}{x-2}=1$$ We can apply all the limit laws here like normal: $$\frac{\lim_{x\to4}(f(x)-5)}{\lim_{x\to4}(x-2)}=1$$ $$\frac{\lim_{x\to4}f(x)-\lim_{x\to4}5}{4-2}=1$$ $$\frac{\lim_{x\to4}f(x)-5}{2}=1$$ $$\lim_{x\to4}f(x)-5=2$$ $$\lim_{x\to4}f(x)=7$$
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