The greatest common factor is the lowest of the powers in this case.
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The GCF is 3x
3x + 1)(3x - 4)
There's a chance this was notated incorrectly. It looks like it wants to be some combination of 3x and 2. 9x2 + 12x + 4 = (3x + 2)(3x + 2) or (3x + 2)2 -9x2 - 12x - 4 = -(3x + 2)2 9x2 - 12x + 4 = (3x - 2)2 -9x2 + 12x - 4 = -(3x - 2)2
Factor them.2 x 3 x 3 = 182 x 3 x 5 = 30Combine the factors, eliminating duplicates.2 x 3 x 3 x 5 = 90, the LCM
When you simplify each of those expressions you get 120xy, 210xy and 216xy. The GCF of those is 6xy because it divides evenly into all of them.