SOLUTION: What is a^2 + 225 = 0 (my answer - 15,-15 was wrong)

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Question 533405: What is
a^2 + 225 = 0
(my answer - 15,-15 was wrong)
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
aČ + 225 = 0
      aČ = -225
       a = ±sqrt%28-225%29
       a = ±sqrt%28%28225%29%28-1%29%29
       a = ±sqrt%28225%29sqrt%28-1%29
       a = ±15i

Two solutions:

 a = 15i,   a = -15i

Edwin