#### Answer

$-2t^4+5t^2$

#### Work Step by Step

We combine the like terms,
($t^4$ and $t^2$)
$t^4*(7-9)+t^2*(7-2)$ or $-2t^4+5t^2$

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Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

$-2t^4+5t^2$

We combine the like terms,
($t^4$ and $t^2$)
$t^4*(7-9)+t^2*(7-2)$ or $-2t^4+5t^2$

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