1)√х+1 =3 (√х+1)² = 3² х+1=9 х=8 2)√х-2=5 (√х-2)²=5² х-2=25 х=27 3)√4+х=√2х-1 (√4+х)²=(√2х-1)² 4+х=2х-1 х=3