solve for all solutions of 2x^3-4x^2-2x+4=0 (unrestricted)
this can also be written as ...
2x^3 -4x^2 -2x+4 = 0
2x^3 -2x -4x^2 +4 = 0
2x(x^2 -1)-4(x^2-1) = 0
2(x-2)(x^2-1) = 0
all possible solutions are
x = 2, x=1 , x= -1
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