1) √23-х=х-3
(√23-х)^2=(х-3)^2
23-х=х^2-6х+9
х^2-6х+х+9-23=0
х^2-5х-14=0
х1+х2=5 |х1=7
х1*х2=-14 |х2=-2
2) √4х^2+5х+5=4х+3
(√4х^2+5х+5)^2=(4х+3)^2
4х^2+5х+5=16х^2+24х+9
16х^2-4х^2+24х-5х+9-5=0
12х^2+19х+4=0
Д=в^2-4ас
Д=361-4*12*4=169
х1=-19+13/24=-6/24=-1/4=-0.25
х2=-19-13/24=-32/24=-4/3