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OpenStudy (anonymous):
Find the vertex of the parabola formed by the following quadratic function: y = 7x2 + 21x – 1 (-2, -15) (2, 69) (1, 27) (-3/2, -67/4)
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OpenStudy (jackellyn):
The last one (-3/2, -67/4) Use y = a(x – h)^2 + k
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