2. Use the method of variation of parameters to find a general solution of y" + 4y'+4y = e-2x In x 3. Find the particular solution to the following differential equation: y" + y" + 3y'-5y=0 4. A 20 kg mass is attached to a spring with stiffness k-200N/m. The damping constant b for the system is 140 N-sec/m. a. Find the equation of motion, if the mass is pulled 25 cm to the right of equilibrium and given an initial leftward velocity of 1 m/sec. b. Interpret the results c. When will it first return to its equilibrium position?
