Factors & divisibility

A teacher writes the following product on the board: $(b-7)(b+2) = b^2-5b-14$ Khalil says that $b^2-5b-14$ is a factor of $b-7$. Ramata says that $b^2-5b-14$ is divisible by $b-7$. **Who is correct?** [[☃ radio 1]]