what is the factored form of a2 – 121?
(a – 121)(a – 1)
(a – 11)(a 11)
(a 11)(a 11)
(a – 121)(a 1)
(a – 121)(a – 1)
(a – 11)(a 11)
(a 11)(a 11)
(a – 121)(a 1)