Question

I need help on #3 please.

For Problems 1-4, Use Variation of Parameters to find a single solution, yp, and write the general solution u'1 = -y2g / w u'2 = y1g / W y" - y' - 20y = 108e2t y" - y' - 2y = -9e-t y" + 2y' + y = 4e-t