f(x)-g(x) = 2x^2-x-1 - (4x^2-1)
= 2x^2-x-1-4x^2+1
=-2x^2-x
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f(x)-g(x) = 2x^2-x-1 - (4x^2-1)
= 2x^2-x-1-4x^2+1
=-2x^2-x