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Factor completely. 9x^2 + 4

please help me

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Steve S. | Tutoring in Precalculus, Trig, and Differential CalculusTutoring in Precalculus, Trig, and Diffe...
5.0 5.0 (3 lesson ratings) (3)
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9x^2 + 4 =
 
(3x)^2 - (2i)^2 =
 
(3x - 2i)(3x + 2i)
Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
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 9 X^2 + 4 = ( 3X + 2i) ( 3X - 2i)               i = √-1