Bisection Method Homework: a=-2, b=2, Is b-a=1?

[fonseh]

Homework Statement

In the first photo , interval [-2 ,2 ] means a = -2 , b = 2 , am i right ?
So , how to show that b-a = 1 ?

Homework Equations

The Attempt at a Solution

IMO , b-a = 2+ 2 = 4

for part b , why b - a = -1-(-2) ?
Is there anything wrong with this question ?

 

[BvU]

interval [-2 ,2 ] means a = -2 , b = 2 , am i right ?

Not so: b and a play different roles.

Refer to example 2.3 for how to choose $[a,b]$

 

[fresh_42]

$[-2,2]$ is the interval for which the functions are considered.
The exercise suggests to apply the bisection method on another interval, namely $[-2,-1]$ because you don't need to consider the entire range. For the second question $|b-a|=|-1-(-2)|=|1|=1$.