The differential equation is
and the initial conditions are
.
The auxiliary equation is
.
Find roots of the auxiliary equation.
\
The roots of the auxiliary equation
.
The general solution is 
Substitute the initial condition
in equation (1)

Differentiate equation (1) with respect to x.
\
Substitute the initial condition
in above equation.

Subtract equation (2) from equation (3).
\
Substitute
in equation (2).

Substitute
and
in equation (1).

The general solution is
.
The general solution is
.