( sorry for commenting, I need points to ask questions I dearly apologize!)
I hope I can help!
(9x+4)-(5x+3)
4x + 7
I hope this helps you
3p^4(84p^8)
3.84.p^12
252.p^12
Rewrite equation so that it is homogeneous .

Solve characteristic equation:
The solutions to the homogeneous equation are:

Finally you need the constant term in "cy" to equal 'd' to satisfy the particular solution.