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toz x∈(-∞;0)∨(0;+∞)
b) 3x+9≠0
3x≠-9
x≠-3
toz x∈(-∞;-3)∨(-3;+∞)
c) x²-16≠0
(x-4)(x+4)≠0
x-4≠0 i x+4≠0
x≠4 i x≠-4
toz x∈(-∞;-4)∨(-4;4)∨(4;+∞)
d) x²+1≠0 zawsze poniewaz x²≥0 ; 1>0 toz x²+1≥1>0
x∈(-∞;+∞)