If f(x)=−x2−8x+7 and g(x)=x−1, what does (g−f)(x) equal? (g−f)(x)=x2+9x−8

(g−f)(x)=−x2−7x+6

(g−f)(x)=−x2−9x+8

(g−f)(x)=−8x+8

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