Graphical method:
If f(x)=0 is for any value of x, that value is the root of the equation. A simple method to obtain the root is make a plot of the function and observe where it crosses the X-axis. That value of x will be the root of equation.
Graphical method is not precise. this methos is used to find the rough estmates of roots. These roots further can be used as intial guess for other numerical methods.
Graphical interpretations are useful in understanding of the functions and anticipating the the pifalls of the nemerical methods.
These are very useful when there are multiple roots to an equations, where a numerical method fails to find all the roots.(Especially Bisection method )
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