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Answer: (3x-2)(3x+2)

Step-by-step explanation: this is because 9x^2 and 4 is a perfect square. So the square root of 9x^2 is 3x and because the 4 is negative you have to times 3x by a negative and positive 2.

Answer:

(3x)^2-(4)^2

Step-by-step explanation:

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