Answer
$24x^{4}+18x^{2}$
Work Step by Step
$6x^{2}(4x^{2}+3)$= ...use the Distributive Property.
$=6x^{2}(4x^{2})+6x^{2}(3)$
...multiply coefficients and add exponents.
=$24x^{4}+18x^{2}$
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