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Let f(x)=a^2+b x+c where a ,b , c in R ...

Let `f(x)=a^2+b x+c` where a ,b , c in ` R and a!=0.` It is known that `f(5)=-3f(2)` and that 3 is a root of `f(x)=0.` Then find the other of `f(x)=0.`

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