By 1 decimal place, it means teh x-value approximation needs to be correct to 1 decimal place. In other words, keep getting better approximations and see when your root is trapped between two endpoints which, when rounded to 1 d.p., are the same. For example, if you can deduce the root is between x = 1.15 and x = 1.23, then you know to one decimal place, the root is going to be 1.2. (I just used random values here, wasn't referring to the specific question in the jpeg file).View attachment 31965
What exactly does it mean to one decimal place? Does it have to be the y-value of the function when an x value is tested? IE: F(2.125)=-0.002 which is to three DP, which is even better than one dp, does that mean that answer is x=2.125 as an approximation to 1dp?