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D =
W mianowniku nie może być zero, więc :
x -3 ≠ 0 i x +2 ≠ 0
x ≠ 3 i x ≠ -2
Df = R - { -2; 3}
x-3≠0
x≠3
x+2≠0
x≠-2
D=R - klamra-2;3klamra
x-3=0
x= 3
x+2=0
x= (-2)
D= R - klamra -2, 3klamra