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Math·Advanced Math·Nonlinear functions

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Function $f$ is a quadratic function. The graph of $y=f(x)$ in the $xy$-plane has a vertex at $(-5,-8)$, contains the point $(-6,-10)$, and has a $y$-intercept at $(0,a)$. The graph of $y=6-f(x)$ has a $y$-intercept at $(0,b)$. What is the positive difference between $a$ and $b$?

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