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Dziedzina:
Mianownik musi być różny od zera:
x² + 3x - 10 ≠ 0
Δ = 9 + 40 = 49
√Δ = 7
x₁ = (-3-7)/2 = -5
x₂ = (-3+7)/2 = 2
D = R \ {-5; 2}
Miejsca zerowe funkcji:
x² - 2x = 0
x(x - 2) = 0
x = 0 v x = 2 ∉ D
x = 0