Question

√х+5=х-1 решите уравнение

Answer 1

х+5=(х-1)^2
х+5=х^2-2х+1
х^2-2х+1-х-5=0
х^2-3х-4=0
д=9-4×1×(-4)=25
х1=(3-5)/2=-1
х2=(3+5)/2=4