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miah

  • 3 years ago

What is the vertex of the graph of y = –4(x + 2)2 + 5? (2, 5) (–2, 5) (5, –2) (5, 2) Solve. 5x2 – 20 = 0 x = 5 and x = 4 x = 4 and x = 2 x = –5 and x = 20 x = 2 and x = –2 I think the first one is A and the second one is C

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  1. miah
    • 3 years ago
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    @phi

  2. miah
    • 3 years ago
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    @Callisto

  3. AriPotta
    • 3 years ago
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    the vertex is (-h, k) isn't it? so the vertex should be (-2, 5)

  4. phi
    • 3 years ago
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    look at this http://www.mathwarehouse.com/geometry/parabola/standard-and-vertex-form.php can you figure it out ?

  5. miah
    • 3 years ago
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    ah no

  6. AriPotta
    • 3 years ago
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    5x^2 – 20 = 0 5x^2 = 20 x^2 = 4 sqrt(x^2) = +/- sqrt(4) x = +/- 2

  7. AriPotta
    • 3 years ago
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    so the second one is d

  8. AriPotta
    • 3 years ago
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    does that make sense?

  9. miah
    • 3 years ago
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    yes.

  10. AriPotta
    • 3 years ago
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    ok :]

  11. miah
    • 3 years ago
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    what about the first one ?

  12. AriPotta
    • 3 years ago
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    look at my first post

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