Answer :

[tex]\boxed{3m-4n-8=3m+(-4n)+(-8)}[/tex]
Xhade
3 m - 4 n - 8 
in sum we will use addition symbol i.e plus
so
( 3 m )+ ( -4 n ) + ( - 8) answer...
   as we know that + . - =  - 
so by opening brackets we will again have the given value i.e 3m - 4n - 8..

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