What does a bar over (-) a y mean? The derivative?

Question

anonymous · Answer

attachment

anonymous · Answer

i think it means it is a vector

anonymous · Answer

We're doing Laplace. I dont think its a vector.

anonymous · Answer

well, by looking at your problem it seems to me that it's just the original y equation and after you found you y equation, you did Inverse Laplace Transformation

anonymous · Answer

the original equation is y'''-2y''+y'=2*e^(x) + 2x

anonymous · Answer

what i mean by original equation is your first equation, general solution? i forgot the name

y -> first equation, "original equation", general solution?
y'
y''
y'''

anonymous · Answer

does that mean that the you do not have to put the bar?

anonymous · Answer

i don't see it making any different on the solution so, i don't think i should matter

anonymous · Answer

Thank you for your help! :D