Odpowiedź:
Szczegółowe wyjaśnienie:
c)
x² - 3x + 4 = 0
Δ = (-3)² - 4 * 1 * 4 = 9 - 16 = -7 , -7 < 0 (brak rozwiązań)
d)
x² - 3x = 0
Δ = (-3)² - 4 * 1 * 0 = 9 - 0 = 9
√Δ = 3
x₁ = [-(-3) - 3] / (2 * 1) = (3 - 3) / 2 = 0 / 2 = 0
x₂ = [-(-3) + 3] / (2 * 1) = (3 + 3) / 2 = 6 / 2 = 3
e)
(1/4)x² + 4 = 0
Δ = 0² - 4 * 1/4 * 4 = 0 - 4 = -4 , -4 < 0 (brak rozwiązań)
f)
x² - 6 = 0
Δ = 0² - 4 * 1 * (-6) = 0 + 24 = 24
√Δ = 2√6
x₁ = (0 - 2√6) / (2 * 1) = -2√6 / 2= -√6
x₂ = (0 + 2√6) / (2 * 1) = 2√6 / 2 = √6
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Odpowiedź:
Szczegółowe wyjaśnienie:
c)
x² - 3x + 4 = 0
Δ = (-3)² - 4 * 1 * 4 = 9 - 16 = -7 , -7 < 0 (brak rozwiązań)
d)
x² - 3x = 0
Δ = (-3)² - 4 * 1 * 0 = 9 - 0 = 9
√Δ = 3
x₁ = [-(-3) - 3] / (2 * 1) = (3 - 3) / 2 = 0 / 2 = 0
x₂ = [-(-3) + 3] / (2 * 1) = (3 + 3) / 2 = 6 / 2 = 3
e)
(1/4)x² + 4 = 0
Δ = 0² - 4 * 1/4 * 4 = 0 - 4 = -4 , -4 < 0 (brak rozwiązań)
f)
x² - 6 = 0
Δ = 0² - 4 * 1 * (-6) = 0 + 24 = 24
√Δ = 2√6
x₁ = (0 - 2√6) / (2 * 1) = -2√6 / 2= -√6
x₂ = (0 + 2√6) / (2 * 1) = 2√6 / 2 = √6