Assuming all the missing operational signs are pluses, that factors to (x + 3)(3x2 + 1)
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3x2(x2 - 3)
9 is a multiple of 3. (3x3=9)
(9x - 10)(x + 3)
3x3 -3x2 - 48x - 60 = 0 simply factor out a 3... 3(x3 - x2 - 16x - 20) = 0
3 3x1=3 3x3=9