a)
81x^2=25
81x^2-25=0
(9x-5)(9x+5)=0
9x-5=0 lub 9x+5=0
9x=5 9x=-5
x=5/9 x=-5/9
b)
x^2=4x
x^2-4x=0
x(x-4)=0
x=0 lub x-4=0
x=4
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a)
81x^2=25
81x^2-25=0
(9x-5)(9x+5)=0
9x-5=0 lub 9x+5=0
9x=5 9x=-5
x=5/9 x=-5/9
b)
x^2=4x
x^2-4x=0
x(x-4)=0
x=0 lub x-4=0
x=4