#### Answer

$t = - 3$ OR $ t = 5$

#### Work Step by Step

$t^2-2t - 15 = 0$
$t^2 - 5t + 3t - 15 = 0$
$t(t-5) + 3 (t - 5)=0$
$(t+3)(t-5) = 0$
Therefore
$t + 3 = 0$ OR $t - 5 = 0$
$t = - 3$ OR $ t = 5$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$t = - 3$ OR $ t = 5$

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