Please need an answer asap

Find y as a function of a if y" - 3y" - y + 3y =0, y(0) - 8, y'(0) = 8, y'(0) = 32. y(3) = Find y as a function of a if y(4) - 6y" + 9y" =0, y(0) = 15, y'(0) = 2, y"(0) = 9, y"(0) = 0. y(ac) = Find y as a function of ac if ?" - 10y' + 16y = 0, y(0) - 9, y'(0) = 4, y"(0) -9. y(z) =