Solve 4y″ − y = xe^{x/2} with y(0) = 1, y′(0) = 0 by variation of parameters

Exercise 4.6.19

$Handwritten solution, page 1 of 2. Solve 4y″ − y = xe^{x/2} with y(0) = 1, y′(0) = 0 by variation of parameters$ $Handwritten solution, page 2 of 2. Solve 4y″ − y = xe^{x/2} with y(0) = 1, y′(0) = 0 by variation of parameters$