Question

Vertify
the - (-a) = a for a = - 19
21​

Answer 1

ATQ,

a=(-19)

Verification

-(-a) = a

Put value of a

-(-(-19)=-19

We known (-) multiplied with (-) then its changes to (+)

So,.

-(19)=(-19)

Remove brackets then

-19 = -19

Hence proved.

Mark as brainlist ans. With thanks.