Concept : 1 Mark
Simplification : 2 Marks
Verification : 1 Mark
34+(−56+78)=(34+−56)+78
L.H.S =34+(−56+78)
=34+(−20+2124)
=34+124
=1924.........(1)
R.H.S =(34+−56)+78
=(9−1012)+78
=−112+78
=−2+2124
=1924........(ii)
From (i) and (ii) LHS = RHS .
Hence verified.