How to solve manually no calculator

First find lowest common denominator which is 9 so -1/3 becomes -3/9. Since you are subtracting a negative fraction the signs change positive making it an addition problem. -3/9 +11/9=8/9 It says to square the answer but it also asks for square root which would cancel out squaring it so 8/9

Pull terms out
-1/3 - (- 11/9)
 simplify each term 
-1/3 + 11/9
Common denominator, multiply by 3/3
-1/3 3/3 +11/9
-1.x3/9 + 11/9
combine Numerator over denominator
- (1x3)+11 the whole thing over 9
then simplify
your answer should be 8/9 exact form
and 0.88888888... in decimal form