Differential Equations: Linear DE ( not sure)
pls see photo

my professor wrote this on the board and I am having a hard time to understand his answers pls help.

Question

Differential Equations: Linear DE ( not sure) 
pls see photo

my professor wrote this on the board and I am having a hard time to understand his answers pls help.

yamyam70 · Answer

attachment

zepdrix · Answer

It's not a differential `equation` at this point,
it's just an `expression`.

Where is the equals sign?
All of this equals zero or something?

And also, ouch my neck hurts :( rotateeeee

3mar · Answer

|dw:1479657954037:dw|

3mar · Answer

I think this also would help you.

Pick up your case of differential equations and try to solve it!

yamyam70 · Answer

3mar thanks for that material!

yamyam70 · Answer

zepdrix sorry forgot to rotate it anyway. I got it guys thanks! :)

3mar · Answer

Don't mention it!
I am happy to hear that.

Just if you need any help, don't hesitate to ask me and I will never be late for you In Sha' Allah.