Let f(x) = ax2 + bx + c, where a, b and c are certain constants and a ? 0. It is

Let f(x) = ax2 + bx + c, where a, b and c are certain constants and a ? 0. It is known that f (5) = ?3f (2) and that 3 is a root of f(x) = 0.
What is the other root of f(x) = 0?

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