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x² - 2≠0
(x+√2)(x-√2)≠0
x≠-√2 ∧ x≠√2
D= R \{-√2, √2}
x+4=0
m.z. x=-4
e)
x²+1≠0 dla kazdego x∈ R
D= R
2x²=0
m.z. x=0
f)
x²+9≠0 dla kazdego x∈ R
D= R
x+1=0
m.z. x=-1
k)
x-3>0
x>3
D=(3,+∞)
m.z. x=0