hmmm. yeah I see your point. Except I get 1.4 after 3 bisections. First bisection = 1.5, second bisection = 1.25 and third = 1.375 rounded to 1.4.

The only thing I can think of is that they don't count 1.5 as a bisection but a starting point. If in other similar questions you find that it is off by 1 bisection then I say they don't count the first one. If you are correct in other questions then maybe a mistake?

also I'd say 0 = x/2 -1/x

,x>0, has a solution in the interval [1, 2].

and the equation

has a root in the interval...