9m = 81 …(i)
Substituting m = 3 in L.H.S. of equation (i),
L.H.S. = 9 × (3)
= 27
R.H.S. = 81
∴ L.H.S. ≠ R.H.S.
∴ m = 3 is not the solution of the given equation.
Substituting m = 9 in L.H.S. of equation (i),
L.H.S. = 9 × (9)
= 81
R.H.S. = 81
∴ L.H.S. = R.H.S.
∴ m = 9 is the solution of the given equation.
Substituting m = – 3 in L.H.S. of equation (i),
L.H.S. = 9 × (- 3)
= -27
R.H.S. = 81
∴ L.H.S. ≠ R.H.S.
∴ m = – 3 is not the solution of the given equation.