(1).9(2x-1)^2-16=0
(2x-1)^2=16/9
2x-1=±4/3
x=7/6,x=-1/6
(2).(x+2)^2=(2x+3)^2
x+2=±(2x+3)
x+2=2x+3或x+2=-2x-3
x=-1,x=-5/3
(3).(x+1)^2-12=0
(x+1)^2=12
x+1=±2√3
x=1±2√3
(4).(6x-1)^2=25
6x-1=±5
x=1,x=-2/3
(5).(x+1)^2=(1-2x)^2
x+1=±(1-2x)
x+1=1-2x,x+1=-1+2x
x=0,x=2
(6).(50+t)^2=100
50+t=±10
t=-40,t=-60
(7).7-2x^2=-15
2x^2=22
x^2=11
x=±√11