If that's 3x2 - 7x + 4, the answer is (3x - 4)(x - 1)
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You need to know whether the given factor is x + 5 or x - 5. Then it is a simple problem in long division.
-3(x + 2)(x + 4)
9x(x2+3x-10) * * * * * 9x3 + 27x2 - 90x = 9x(x2 + 3x - 10) = 9x(x + 5)(x - 2).
Since 3x is a factor of 3x^2, it is automatically the GCF.
3x2 - 3x - 60 = 3(x2 - x - 20) = 3(x2 - 5x + 4x - 20) = 3(x[x - 5] + 4[x - 5]) = 3(x + 4)(x - 5)