Use the method of variation of parameters to solve the initial value problem x' = Ax + f(t) x(a) = x_{a} using the following values. A= [[5, - 1], [6, - 2]] .f(t)=[ matrix 19e^ 31 \\ 34e^ 3t matrix ].x(0)=[ matrix 0\\ 0 matrix ].e^ At = 1 5 [ matrix 6e^ 4t -e^ -1 &-e^ 4t +e^ -1 \\ 6e^ 4t -6e^ -1 &-e^ 4t +6e^ -1 matrix ] x(t) =