First we find the general integral of the 'incomplete equation' solving the second order equation...

(1)

... that has the solutions . The general integral of the 'incomplete equation' is then...

(2)

The next step is to find a particular integral of the 'complete equation'. At this purpose we search a function of the type . If we substitute in the DE we find and . The general integral of the 'complete equation' is then...

(3)

Kind regards