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Hello! How are you all?

Let us assume that we have given an equation of a curve like y=3x

^{2}+3x-1

By numerical analysis(bisection method) I want to find its root.

Everything is fine in the case if interval is given (a,b).

But my problem is that if interval is not given then what should I do? Means what should I taken as "a" or what should I taken as "b" to get first mid-point?

As I know that "a" & "b" have opposite signs.

Thanks in advance.