P2−4P+5=0P^2-4P+5=0P2−4P+5=0
P2+5P−4=0P^2+5P-4=0P2+5P−4=0
P2+4P−5=0P^2+4P-5=0P2+4P−5=0
P2−5P+4=0P^2-5P+4=0P2−5P+4=0