#### Answer

$$36x^5-12x^3$$

#### Work Step by Step

$f(x)=3x^4(2x^2-1)$
$\frac{d}{dx}[3x^4]\times(2x^2-1) +(3x^4)\times \frac{d}{dx}2x^2-1$
$12x^3(2x^2-1)+3x^4(4x)$
$24x^5-12x^3+12x^5$
$36x^5-12x^3$

Published by
Pearson

ISBN 10:
0321947347

ISBN 13:
978-0-32194-734-5

$$36x^5-12x^3$$

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