Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 2 - Chapter Test - Page 235: 18

Answer

(a) $\frac{1}{x}+2\sqrt{x}$ (b) $\frac{1}{x}-2\sqrt{x}$ (c) $\frac{2\sqrt{x}}{x}$ (d) $\frac{1}{2x\sqrt{x}}$ (e) $\frac{1}{2\sqrt{x}}$ (f) $2\sqrt{\frac{1}{x}}$

Work Step by Step

(a) $(f+g)(x)$ $=f(x)+g(x)$ $=\frac{1}{x}+2\sqrt{x}$ (b) $(f-g)(x)$ $=f(x)-g(x)$ $=\frac{1}{x}-2\sqrt{x}$ (c) $(fg)(x)$ $=f(x)g(x)$ $=\frac{1}{x}(2\sqrt{x})$ $=\frac{2\sqrt{x}}{x}$ (d) $(f/g)(x)$ $=\frac{f(x)}{g(x)}$ $=\frac{\frac{1}{x}}{2\sqrt{x}}$ $=\frac{1}{2x\sqrt{x}}$ (e) $(f\circ g)(x)$ $=f(g(x))$ $=\frac{1}{2\sqrt{x}}$ (f) $(g\circ f)(x)$ $=2\sqrt{\frac{1}{x}}$
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