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Math·Advanced Math·Nonlinear functions

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The function $f$ is defined by $f(x)=a^x+b$, where $a$ and $b$ are constants. In the xy-plane, the graph of $y=f(x)$ has an x-intercept at $(2,0)$ and a y-intercept at $(0,-15)$. What is the value of $b$?

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