This doesn't factor neatly. Applying the quadratic equation, we find two imaginary solutions: (-17 plus or minus the square root of -671) divided by 12
x = -1.4166 + 2.158638974498103i
x = -1.4166 - 2.158638974498103i
where i is the square root of negative one.
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x2 + 3x - 40 = (x + 8)(x - 5)
(x + 8)(x - 5)
9x - 9 = 36 9x = 45 x = 5
1x40, 2x20, 4x10, 5x8 are all the factor pairs of 40.
The greatest common factor of 40 and 63 is 1.