Answer
$12a^{2}(6ab^{2}+1-2a^{2}b^{2})$
Work Step by Step
$ 72a^{3}b^{2}+12a^{2}-24a^{4}b^{2}\qquad$... factor out the common term, $12a^{2}$
$=12a^{2}(6ab^{2}+1-2a^{2}b^{2})$
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