Am I correct?
Express as the product of four factors.
a⁶ - b⁶
=(a - b)(a⁵ + a⁴b + a³b² + a²b³ + ab⁴ + b³)
Express as the product of three factors.
a⁴ - b⁴
=(a - b)(a³ + a²b + ab² + b³)
As I believe I told you on a different forum, think of as and factor as the "difference of two squares", . Since those are both odd powers, each will factor as you have above.
Think of as . Again, you can factor that as the "difference of two square": . Now, you can factor again but since you have an even power now, you cannot factor [tex]x^2+y^2[tex] further.