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factor this completley

9a2-4

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Phillip R. | Top Notch Math and Science Tutoring from Brown Univ GradTop Notch Math and Science Tutoring from...
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difference of squares x2 - y2 where x = 3a and y = 2
 
difference of squares factors into (x + y)(x - y) = (3a + 2)(3a - 2)