The Student Room Group
Reply 1
You need to use two values possibly .05 either side of your answer to your answer in A. Put these two values into the interation formular. One should be positive and the other negative, showing there is a root in that interval because of the change of sign.
My thoughts.

Since you are quoting an answer to 3 dec. pl., i.e. to the nearest thousanth. Then you need to check either side by half that amount to confirm that the root lies in that small interval.
So you need 0.001/2 = 0.0005 either side.

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