х^2-2(р-1)х+р^2-2р-3=0
D=4(p-1)^2-4*(p^2-2p-3)=4p^2-8p+4-4p^2+8p+12=16
x1= {2p-2+4)/2 =p+1
x2 = {2p-2-4}/{2} =p-3
х^2-2(р-1)х+р^2-2р-3=0
D=4(p-1)^2-4*(p^2-2p-3)=4p^2-8p+4-4p^2+8p+12=16
x1= {2p-2+4)/2 =p+1
x2 = {2p-2-4}/{2} =p-3