4u2 - 6u - 39 does not have rational factors.
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3a squared b squared
9 x 9 = 81 9 squared = 81 3 squared times 3 squared = 81
I'm presuming its factors for a monic quadratic trinomial--of form : X squared + BX + C . You need the numbers that MULTIPLY to give C and ADD up to give B Eg X squared + 8X + 12 factors to ( X+2) (X + 6 ) BUT X squared + 7X + 12 factors to (X +3 )(X + 4) Hope this helps. Phil.
Any prime number to the 5th power squared has 11 factors, like 1024 or 59049.
5(x + 3)(x + 1)