Reading my first calculus course at my first semester as an "Computer Engineer". In Sweden it's called "Single Variable Calculus". I have my first exams next week and i have been solving differents of DE's. y'-3y'+2y = 2ex But now i have encountered a problem in my "partikulär lösning", z'' -z' = 2. Before when i just had z'' = 2, i could integrate it twice and get my solution. Sorry for my ignorance, im totally new and i hope i have formulated my question good.