SOLUTION: factor out 4xsquared + 9

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Question 53463: factor out 4xsquared + 9
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Factor:
4x%5E2%2B9 This is a sum of two squares:
%282x%29%5E2+%2B+%283%29%5E2
The sum of two squares factors as:
a%5E2%2Bb%5E2+=+%28a%2Bbi%29%28a-bi%29, so:
4x%5E2%2B9+=+%282x%2B3i%29%282x-3i%29 where: i+=+sqrt%28-1%29