Question

Verify that -(-a)=a is true for a= -19/21

Answer 1

Answer:

if a = - 19/21

then,

-(-a) = a

put the value of a = - 19/21

-[-( -19/21) ] = -19/21

-[ 19/21 ] = -19/21

-19/21 = -19/21

hence, proved

hope it helps you

Answer 2

Answer:

$- ( - a) = a$

$if\:a = \frac{-19}{21}\\</p><p>\\</p><p>then </p><p>\\</p><p>⟹- [ -( \frac{-19}{21} ) ] = \frac {-19}{21}\\</p><p>\\</p><p>⟹- [ \frac {19}{21} ] = \frac{-19}{21}\\</p><p>\\</p><p>⟹\frac{-19}{21} = \frac {-19}{21}$

hence, proved