Question

Verify that – (-x) is the same as x for `x = (-21)/31`.

Answer 1

Additive inverse of `"x" = (-21)/31 "is -x" = 21/31 "since" (-21)/31 + 21/31 = 0.`

The same equality `(-21)/31 + 21/31 = 0,`

shows that the addiditive inverse of `21/31 "is" (-21)/31, i.e., -(-x) = x`.