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A financial analyst uses the rational function R(x)=4x2−16x8x2−16x−64R(x) = \frac{4x^2 - 16x}{8x^2 - 16x - 64} to model the risk-to-reward ratio of an investment over time xx (in months). The model becomes undefined when the denominator is zero. When determining the domain of this function, solving the equation 8x2−16x−64=0{}8x^2 - 16x - 64 = 0 results in two excluded values. The positive value that must be excluded from the domain is ____.

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Updated 2026-09-18

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