Source: http://perso.eleves.ens-rennes.fr/people/clementine.laurens/Documents%20page%20web%20perso/CPGE/Cours%20et%20fiches%20de%20r%C3%A9vision/Recherche%20d%27une%20solution%20particuli%C3%A8re%20pour%20certaines%20suites%20r%C3%A9currentes%20lin%C3%A9aires%20d%27ordre%202%20avec%20second%20membre%20%28m%C3%A9thode%29.pdf