Suppose f x is a continuous function with continuous first and second derivatives where f 6 8 f 6 5 and f a is always negative

Question

Suppose f x is a continuous function with continuous first and second derivatives where f 6 8 f 6 5 and f a is always negative Assume that the graph of y f x crosses the x axis exactly once The Select an answer possible value of the intercept will be x

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