#### Answer

$x^4-x^3+7x^2-9x-18$

#### Work Step by Step

We need to write down the polynomial $f(x)$ in factored form.
$f(x)=(x+1)(x-2)(x-3i)(x+3i)$
$=(x^2+x-2x-2)(x^2+9)$
$=x^4+9x^2-x^3-9x-2x^2-18$
$=x^4-x^3+7x^2-9x-18$

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Published by
McDougal Littell

ISBN 10:
0618595414

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

$x^4-x^3+7x^2-9x-18$

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