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Factor completely. 9x^2 + 4

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2 Answers

9x^2 + 4 =
 
(3x)^2 - (2i)^2 =
 
(3x - 2i)(3x + 2i)
 9 X^2 + 4 = ( 3X + 2i) ( 3X - 2i)               i = √-1