According to the Rational Root Theorem, negative 7 eighths is a potential rational root of which function?

By the Rational Root Theorem, a reduced fraction p/q can be a rational root only if p divides the constant term and q divides the leading coefficient. For −7/8, 7 must divide the constant term and 8 must divide the leading coefficient. In choice A, the constant term is −28 and the leading coefficient is 24; 7 divides −28, and 8 divides 24. So choice A meets both requirements.

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