To rewrite the expression \( 8t + 8v \) using the product rule, we can factor out the common term. The expression can be rewritten as follows:
\[ 8t + 8v = 8(t + v) \]
So, the expression \( 8t + 8v \) can be represented as \( 8(t + v) \) using factoring, which is related to the concept of the product rule in calculus, though it is more of a factoring rather than applying the rule directly.