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Type : Subjective

Question Statement :

Let $f (x) = a x^{2} + b x + c$ , where a, b and c are Real numbers, where ‘a’ is not equal to zero. It is known that f(5)=-3f(2) and that 3 is a root f(x)=0, then find the other root of f(x)=0

Type in your answer as an integer. For example, if your answer is 8, type in 8