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posted by Nathan Monday, April 9, 2012 at 9:34am.

Factor over {complex numbers} 9x^2 + 49

how about ... (3x + 7i)(3x - 7i) ? check: (3x + 7i)(3x - 7i) = 9x^2- 49i^2, but i^2= -1 = 9x^2 - 49(-1) = 9x^2 + 49

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