x²-6x+9≠0
(x-3)²≠0
x-3≠0
x≠3
D=R\{3}
Mianownik ulamka ma byc rozny od zera
(a-b)²=a²-2ab+b²
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x²-6x+9≠0
(x-3)²≠0
x-3≠0
x≠3
D=R\{3}
Mianownik ulamka ma byc rozny od zera
(a-b)²=a²-2ab+b²