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Math·Advanced Math·Nonlinear functions

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The graph of the quadratic function $y=f(x)$ in the $xy$-plane intersects the $x$-axis when $x=39$ and when $x=p$, where $p$ is a constant. The maximum value of $y=f(x)$ occurs at the point $(14,m)$, where $m$ is a constant. What is the value of $p$?

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