Question

verify that–(–x) =xfor x= -21/31

Answer 1

Answer:

$given \: x = - \frac{21}{31}$

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

$= > \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: =-(\frac{21}{31})=-\frac{21}{31}=x$

$= > - (- x) = x$