A)√5x+8=6
5x+8-36=0
5x-24=0
a=5,b=0,c=-24
D=b²-4ac=480≈30²
x1,2=-b±√D/2a=±30/10
x1=3
x2=-3
б)√х²-4х+13=5
х²-4х+13-25=0
х²-4х-12=0
D=b²-4ac=16+48=64=8²
x1,2=-b±√D/2a=4±8/2
x1=6
x2=2
в)√х²-4-√8х+5=0
x²-8х+1=0
D1=b²-4ac=64-4=60≈8
x1,2=-b±√D/2a=8±8/2
x1=8
x2=0,5
г)√2х²-5х+1=х-1
2х²-6х+2=0
D=b²-4ac=36-16=20≈4,5²
x1,2=-b±√D/2a=6±4,5/4
x1=2,6
x2=0,3