3x2 + 2x - 21 = (3x - 7) (x + 3)
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(3x + 7)(x - 3)
if you rearrange it, it becomes 4y + 8 = 3x2 -2x +1 4y = 3x2 -2x -7 y= (3x2 -2x -7)/4 which is a parabola
3x3 - 3x2 + 2x - 2 = 3x2(x - 1) + 2(x - 1) = (3x2 + 2)(x - 1)
x^5+2x^4+4x^2+2x-3
2x2 + x2 = 3x2