This document is from IFET College of Engineering and presents information on solving second order linear differential equations with constant coefficients. It defines such an equation as one where the highest order derivative is of order 2 and all coefficients are constants. The general solution is described as the sum of the complementary function and particular integral. Various cases are discussed for the complementary function depending on whether the roots are real/complex and distinct or repeated. Methods like variation of parameters and Cauchy's and Legendre's equations are also mentioned for solving related problems.