Multiply Powers: Solve 8^7 × 8^8 × 9^7

The goal is to express the given expression $8^7 \times 8^8 \times 9^7$ using properties of exponents.

First, observe that $8^7$ and $9^7$ share a common exponent of $7$. So, they can be factored as:

$(8 \times 9)^7$.

This handles the product $8^7 \times 9^7$. Now, include $8^8$ which is not part of the factoring:

$(8 \times 9)^7 \times 8^8$.

This resulting expression matches the provided possible choice.

Therefore, the rewritten expression is $\left(8 \times 9\right)^7 \times 8^8$.