Answer
$a^{4}-36$
Work Step by Step
$(a^{2}+6)(a^{2}-6)$
To evaluate this product, use the following formula:
$(x-y)(x+y)=x^{2}-y^{2}$
Here, $x=a^{2}$ and $y=6$
$(a^{2}+6)(a^{2}-6)=(a^{2})^{2}-(6)^{2}=a^{4}-36$
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