Answer
$v^{2}-36$
Work Step by Step
...identify which terms correspond to $a $ and $b $
in the rule for the product of a sum and difference.
($(a+b)(a-b)=a^{2}-b^{2}$)
$a=v,\ b=6$
...substitute for $a $and $b $in the rule
$(v+6)(v-6)=v^{2}-6^{2}$
...simplify.
=$v^{2}-36$
