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jawab:
((f-g)h)(x)==(f.(g.h))(x)
((2x+1 . x^2-2)x+1)=(2x+1(x^2-2 . x+1)
((2x^3-4x+x^2-2)x+1)=(2x+1(x^3+x^2-2x-2)
2x^4+2x^3-4x^2-4x+x^3+x^2-2x-2=2x^4+2x^3-4x^2-4x+x^3+x^2-2x-2
2x^4+2x^3+x^3-4x^2+x^2-4x-2x-2=2x^4+2x^3+x^3-4x^2+x^2-4x-2x-2
2x^4+3x^3-3x^2-6x-2=2x^4+3x^3-3x^2-6x-2
biar lebih mudah kita ambil yang -6x, jadi
-6x=2x^4-2x^4+3x^3-3x^3-3x^2+3x^2-6x-2+2
-6x=-6x
x= -6/6
x= -1