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Work Shown:
(g - f)(x) = g(x) - f(x)
(g - f)(x) = (-4x+1) - (x^2+2x-4)
(g - f)(x) = -4x+1 - x^2-2x+4
(g - f)(x) = -x^2+(-4x-2x)+(1+4)
(g - f)(x) = -x^2 - 6x + 5
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