### Instruction: Factor the following expression: $28z^{97}+7z^{96}$.### Response: I notice that both terms in the expression have a common factor of $7z^{96}$, so I can use the distributive property to factor it out.
I write the expression as $7z^{96}(4z+1)$, and that's the final answer, since the second factor is irreducible.