Solve the initial value problem below using the method of Laplace transforms. y ′′
+2y ′
−15y=0,y(0)=−4,y ′
(0)=28 Click here to view the table of Laplace transforms. Click here to view the table of properties of Laplace transforms. What is the Laplace transform Y(s) of the solution y(t) ? Y(s)= Solve the initial value problem. y(t)= (Type an exact answer in terms of e.)