Answer
$\pm2,\pm2i$
Work Step by Step
$f(t)=t^4-16=(t^2+4)(t^2-4)$. Let $f(t)=0$, we get $t=\pm2,\pm2i$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 2 - Linear and Quadratic Functions - Section 2.7 Complex Zeros of a Quadratic Function* - 2.7 Assess Your Understanding - Page 178: 31
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