OK here is my problem:
And these are my steps
*C1, C2, C3 = Csub1, Csub2, Csub3
y = C1e^0x + C2e^2x + C3e^-x
solution: y = C1 + C2e^2x + C3e^-x
but when checking the problem on Wolfram Alpha, the solution is:
y = C1 + (1/2)C2e^2x + C3(-e^-x)
Is there a step I'm missing?