Working Backwanls Write the standard form (equation (16) with leading coefficient an = 11) of the nth

Question:

Working Backwanls Write the standard form (equation (16) with leading coefficient an = 11) of the nth order linear homogeneous differential equation with real coefficients whose roots are given in Problems 1-3?
1. y" + 4v = 0, y(0) = 1 , y'(0) = -1
2. y" - 4y' + 13y = 0, y(0) = 1 . y'(0) = 0
3. y" + 2y' + 2y = 0, y(0) = 1 , y'(0) = 0