Factorize X^2-1.
Hence factorize(a+3)^2-1.
x^2-1=(x-1)(x+1)
(a+3)^2-1=(a+3-1)(a+3+1)=(a+2)(a+4)
That´s my way, and i though have the same answer!
Factorize X^2-1.
Hence factorize(a+3)^2-1.