Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter P - P.1 - Graphs and Models - Exercises - Page 8: 22

Answer

$y$-intercepts: (0, 1), (0, -1) $x$-intercepts: (1, 0)

Work Step by Step

Set $x=0$ to find $y$-intercept(s): $y=(0-1)\sqrt (0^2 +1)$ $y=-1(\pm\sqrt (1))$ $y=-1(\pm1)$ $y=\pm1$ Thus, the $y$-intercepts are (0, 1) and (0 -1). Set $y=0$ to find $x$-intercept(s): $0=(x-1)\sqrt(x^2+1)$ $x-1=0$ or $\sqrt(x^2+1)=0$ $x=1$ or $x^2+1=0$ $x=1$ or $x^2=-1$ $x=1$ or $x=\sqrt(-1)$ $\sqrt(-1)$ is a non-real result. Thus, the only $x$-intercept is (1, 0).
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