(a^2+3a-3)•(a^2+3a+1)-5

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(a^2+3a-3)•(a^2+3a+1)-5

(a^2+3a-3)•(a^2+3a+1)-5
(a^2+3a-3)•(a^2+3a+1)-5

(a^2+3a-3)•(a^2+3a+1)-5
(a^2+3a-3)(a^2+3a+1)-5
=(a²+3a)²-2(a²+3a)-3-5
=(a²+3a)²-2(a²+3a)-8
=[(a²+3a)-4] [(a²+3a)+2]
=(a+4)(a-1)(a+1)(a+2)