miah
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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miah
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@phi
miah
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@Callisto
AriPotta
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the vertex is (-h, k) isn't it? so the vertex should be (-2, 5)
miah
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ah no
AriPotta
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5x^2 – 20 = 0
5x^2 = 20
x^2 = 4
sqrt(x^2) = +/- sqrt(4)
x = +/- 2
AriPotta
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so the second one is d
AriPotta
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does that make sense?
miah
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yes.
AriPotta
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ok :]
miah
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what about the first one ?
AriPotta
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look at my first post