SOLUTION: Factor completely. a^4-1296

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Question 409850: Factor completely. a^4-1296
Found 2 solutions by robertb, josmiceli:
Answer by robertb(5830) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
a%5E4-1296
%28a%5E2+%2B+36%29%2A%28a%5E2+-+36%29
%28a%5E2+%2B+36%29%2A%28a+%2B+6%29%2A%28a+-+6%29
and, also:
a%5E2+=+-36
a+=+6i and
a+=+-6i
a%5E2+%2B+36+=+%28a+%2B+6i%29%2A%28a+-+6i%29
The complete factoring is
%28a+%2B+6i%29%2A%28a+-+6i%29%2A%28a+%2B+6%29%2A%28a+-+6%29