Variation of parameters- 2nd order linear equation

Homework Statement

solve 4y''-4y'+y=16et/2

v1= -∫ y2g/w
v2= ∫ y1g/w

The Attempt at a Solution

http://imgur.com/gxXlfdH

the correct answer is 2t^2 e^(t/2) instead of what i have though, i am not sure what i am doing wrong?

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pasmith
Homework Helper

Homework Statement

solve 4y''-4y'+y=16et/2

v1= -∫ y2g/w
v2= ∫ y1g/w

The Attempt at a Solution

http://imgur.com/gxXlfdH

the correct answer is 2t^2 e^(t/2) instead of what i have though, i am not sure what i am doing wrong?
You need to divide by the coefficient of $y''$ before you start:
$$y'' - y' + \frac14 y = 4e^{t/2} \equiv g(t).$$