a)1/9x^2=16
x^2=16×9
x1,2=+-√16×9
x1,2=+-12
b)2x^2=3
x^2=3/2
x1,2=+-√3/√2
x1,2=+-√6/2
c)9x^2=10
x^2=10/9
x1,2=+-√10/3
d)4x^2=0,5
x^2=5/10:4
x^2=5/40
x1,2=+-√5/√4×10
x1,2=+-√50/20
x1,2=5√2/20
x1,2=√2/4
e)2x^2=18
x^2=18:2
x^2=9
x1,2=+-3
f)2x+1=+-√27
2x+1=3√3
x1=(3√3-1)/2
x2=(-3√3-1)/2
4x^2=1
x^2=1/4
x1,2=+-1/2
2x^2=225
x^2=√225/√2
x^2=√450/2
x1,2=+-15√2/2
4x^2=0,04
x^2=0,01
x1,2=+-√1/100
x1,2=+-1/10