\color{red} \textrm{Show Your Work}! You must show your work with enough detail to clearly indicate:
Which exponent law/property you used
That you solved the problem algebraically (with equation-based methods)
Even with the correct answer, responses without enough work will receive no credit.
Finally, when possible, remember that it is best to write polynoials arranging each monomial term with variables in alphabetical order. And the monomials within a polynomials should be listed by descending degree.