10x^2 - x - 2
= (5x + 2)(2x - 1)
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The factors are [3x + 5 - 2*sqrt(10)] and [3x 5 + 2*sqrt(10)].
(x + 2)(x - 9)
What is the question? Do you want to factor 3x2 -x -2? If that is the question the answer is (3x + 2)(x-1)
(x + 2)(3x - 1)(3x + 1)
x^2-x+1 cannot be factorised