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djyliett [7]
3 years ago
11

Which equation is y = 9x2 + 9x – 1 rewritten in vertex form?

Mathematics
1 answer:
Jlenok [28]3 years ago
6 0
<u>Vertex for X</u>
-\frac{9}{2(9)} = -\frac{2}{18} = -\frac{1}{9}

<u>Vertex for Y</u>
y = 9x^{2} + 9x - 1 \\y = 9(-\frac{1}{9})^{2} + 9(-\frac{1}{9}) - 1 \\y = 9(\frac{1}{81}) - 1 - 1 \\y = \frac{1}{9} - 1 - 1 \\y = -\frac{8}{9} - 1 \\y = -1\frac{8}{9}

<u>Vertex</u>
(h, k) = (⁻¹/₉, -1⁸/₉)
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