Question

verify that -(-x)=x for x=21/31

Answer 1

 Now the x=21/31

 let put the x to the -(-x)

  -(-21/31)

  - and - becomes +

∴ -(-21/31)=21/31
  
    Hope it helps.........

Answer 2

Answer:

The given expression -(-x) = x is true for $x= \frac{21}{31}$

Step-by-step explanation:

The number x is given by

$= \frac{21}{31}$

By the property of the subtraction, we can say that

The negative of the negative number is always positive or the multiplication of two negative numbers is always positive

That is (-)(-) = (+)

$-(-\frac{21}{31} ) =\frac{21}{31}$

Therefore the given expression -(-x) = x for $x= \frac{21}{31}$ is true