81x^2-9=0 |:9
9x^2-1=0
(3x-1)(3x+1)=0
3x-1=0 lub 3x+1=0
3x=1 |:3 3x= - 1 |:3
x=1/3 x= - 1/3
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81x^2-9=0 |:9
9x^2-1=0
(3x-1)(3x+1)=0
3x-1=0 lub 3x+1=0
3x=1 |:3 3x= - 1 |:3
x=1/3 x= - 1/3