College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Chapter 1 Review - Exercises - Page 170: 73


$x=\pm 4$ or $x=\pm 4i$

Work Step by Step

We solve by factoring: $x^{4}-256=0$ $(x^{2}-16)(x^{2}+16)=0$ $x^2-16=0$ or $x^2+16=0$ $x=\pm\sqrt{16}$ or $x=\pm\sqrt{-16}$ $x=\pm 4$ or $x=\pm 4i$
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