Odpowiedź:
Szczegółowe wyjaśnienie:
Zad 6
f(x) = -1/2 x² + 2x + 2 = (-1/2 x² + 2x - 2) + 4 = -1/2 (x² -4x + 4) + 4 = -1/2 (x - 2)² + 4 POSTAĆ KANONICZNA
p = 2 , q = 4 , W = (2,4)
a = -1/2 , -1/2 < 0 (ramiona w dół)
ZW : y ∈ (-∞,4>
Zad 7
f(x) = -x² + 6x - 3 = (-x² + 6x - 9) + 6 = -(x² - 6x + 9) + 6 = -(x - 3)² + 6
p = 3, q = 6 , W = (3,6)
a = -1 , -1 < 0 (ramiona w dół)
Δ = 6² - 4 * (-1) * (-3) = 36 - 12 = 24
√Δ = 2√6
x₁ = (-6 - 2√6) / [2 * (-1)] = (-6 - 2√6) / (-2) = 3 + √6
x₂ = (-6 + 2√6) / [2 * (-1)] = (-6 + 2√6) / (-2) = 3 - √6
f(0) = -0² + 6 * 0 - 3 = 0 + 0 - 3 = -3
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Odpowiedź:
Szczegółowe wyjaśnienie:
Zad 6
f(x) = -1/2 x² + 2x + 2 = (-1/2 x² + 2x - 2) + 4 = -1/2 (x² -4x + 4) + 4 = -1/2 (x - 2)² + 4 POSTAĆ KANONICZNA
p = 2 , q = 4 , W = (2,4)
a = -1/2 , -1/2 < 0 (ramiona w dół)
ZW : y ∈ (-∞,4>
Zad 7
f(x) = -x² + 6x - 3 = (-x² + 6x - 9) + 6 = -(x² - 6x + 9) + 6 = -(x - 3)² + 6
p = 3, q = 6 , W = (3,6)
a = -1 , -1 < 0 (ramiona w dół)
Δ = 6² - 4 * (-1) * (-3) = 36 - 12 = 24
√Δ = 2√6
x₁ = (-6 - 2√6) / [2 * (-1)] = (-6 - 2√6) / (-2) = 3 + √6
x₂ = (-6 + 2√6) / [2 * (-1)] = (-6 + 2√6) / (-2) = 3 - √6
f(0) = -0² + 6 * 0 - 3 = 0 + 0 - 3 = -3