The equation is .

                                 (Exponentiate each side)

                                     (Exponential form: )

                                     (Add 1 to each side)

Option (a) is a solution of x.

                               (Using calculator: )

.

Option (b) is an approximate solution of x.

option (c) is not a solution of x.

Option (a) is a solution of x, option (b) is an approximate solution of x, and \ \

option (c) is not a solution of x.