That doesn't factor neatly. Applying the quadratic equation, we find two imaginary solutions: (1 plus or minus the square root of -47) divided by 6.
x = 0.16666 + 1.142609100066840i = 1st root = r1
x = 0.16666 - 1.142609100066840i = 2nd root = r2
where i is the square root of negative one. Then factor as (x - r1)(x - r2)
Or you can complete the square to transform the trinomial into the difference of the squares
3x2 - x + 4 factor out 3
= 3(x2 -(1/3)x + 4/3) add and subtract (1/6)2
= 3[x2 -(1/3)x + (1/6)2 - 1/36 + 4/3] simplify
= 3[(x - 1/6)2 + 47/36] write 47/36 = - (-47/36) = - (√-1√47/6)2 = - (i√47/6)2
= 3[(x - 1/6)2 - (i√47/6)2] write the difference of the squares
= 3[(x - 1/6) - (i√47/6)][(x - 1/6) + (i√47/6)]
= 3[(x - (1 + i√47)/6)][(x - (1 - i√47)/6].
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20x2 - 3x + 10 does not have any real factors.
That factors to (x - 3)(x + 6)
(x + 3)(3x - 2)
(3x-2)(x-2)
5x3 - 3x2 + 2x = x*(5x2 - 3x + 2) The quadratic has no real factors.