Have you solved it yet? What did you get?
The DE is of 'separable variables type' and can be written as...
(1)
Because is...
(2)
... is also...
(3)
... so that the solution of (1) is...
(4)
... that can be 'explicitate' as function of x as...
(5)
If now we intend to impose the initial condition we 'discover' that we can do it only if is . To overcome the handycap in case we write (2) as...
(6)
... and repeat the procedure obtaining...
(7)
Kind regards