8.
a)
Zał:
2x ≠ 0 ⇒ x ≠ 0
x² - 2x = x(x - 2) ⇒ x ≠ 0 ∧ x ≠ 2
D = R \ {0, 2}
b)
x² + 4 ≥ 0
x ≠ 0
D = R \ {0}
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8.
a)
Zał:
2x ≠ 0 ⇒ x ≠ 0
x² - 2x = x(x - 2) ⇒ x ≠ 0 ∧ x ≠ 2
D = R \ {0, 2}
b)
Zał:
x² + 4 ≥ 0
x ≠ 0
D = R \ {0}