The function is in the interval .

It follows that . we can therefore apply intermediate value theorem to conclude that there must be some c in such that 

Now we use bisection method for approximating the real zeros of a continuous function.

In this approximation if , then the zero must lie in the interval

The approximated value of zero is , .

Now we have to find out zero value using  graphical approach.

From the above graph the zero value is nearly , it is located between  and .

To find out the accurate value of value we further need to zoom the graphing utility as shown below.

We clearly observe from the above graph the zero value is nearly . 

The zero value approximated to two decimal points is .

The zero value approximated to four decimal points is .