1984 AIME Problems/Problem 12

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Problem

A function $\displaystyle f$ is defined for all real numbers and satisfies $\displaystyle f(2+x)=f(2-x)$ and $\displaystyle f(7+x)=f(7-x)$ for all $\displaystyle x$. If $\displaystyle x=0$ is a root for $\displaystyle f(x)=0$, what is the least number of roots $\displaystyle f(x)=0$ must have in the interval $\displaystyle -1000\leq x \leq 1000$?

Solution

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See also