The equation is linear and so has no vertex.
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-2-5
The vertex of the positive parabola turns at point (-2, -11)
x3+3x2+3x+2 divided by x+2 equals x2+x+1
The given equation is y = x - 4x + 2 which can be written as y = -3x + 2 This is an equation of a straight line. Therefore it has no vertex and so cannot be written in vertex form.
It is the average of -2 and +6, that is, x = 2