y = -0,5x2 + 2x – 1 |
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Lösung
x-Achse: y = 0 0 = -0,5x 2 + 2x – 1 D = b 2 – 4ac = 2 2 – 4·(-0,5)·(-1) = 2 D > 0 → 2 Lösungen x 1 =
= 0,59 x 2 =
= 3,41 S x1(0,59|0) ; S x2(3,41|0) y-Achse: x = 0 y = -0,5·0 2 + 2·0 – 1 = -1 S y(0|-1)
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Note: |
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y = -0,4x2 + 2,4x – 3,6 |
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Lösung
x-Achse: y = 0 0 = -0,4x 2 + 2,4x – 3,6 D = b 2 – 4ac = 2,4 2 – 4·(-0,4)·(-3,6) = 0 D = 0 → 1 Lösung x 1 =
= 3 S x(3|0) y-Achse: x = 0 y = -0,4·0 2 + 2,4·0 – 3,6 = -3,6 S y(0|-3,6)
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Note: |
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