Question

verify that -(-x)=x for
1. x = 11/5
2. x = -13/7

Answer 1

Case 1 :

-(-11/15)=11/15

-(-)= +

SO +11/15= +11/15

Therefore case 1 is proved

Case2 :

-(-(-13/17))= -13/17

-(-)=+

-(+13/17)= -13/17

-(+)= -

SO - 13/17 = - 13/17

Therefore case 2 is proved

Answer 2

-*-=+
Therefore-(-x)=x
Case1
11/5=-(-11/5)
1=1
Case 2
-13/7=-(-(-13/7)
1=1