The Laplace transform method is an operational method that can be used advantageously for solving linear differential equations. By use of Laplace convert many common functions, such as sinusoidal transforms we can functions, damped sinusoidal func- functions, into algebraic functions of a complex tions and exponential tions such as differentiation and integration c be replaced by algebraic operations in the complex plane. Thus a linear differential equation can be transformed into an algebraic equation in a complex variable s. If the algebraic equation in s is solved for the variable, then the solution of the differential equation (the inverse Laplace dependent transform of the dependent variable) may be found by use of a Laplace transform table r y use of the partial-fraction expansion technique, which is presented in Section 2-5.