Write the equation as f(x) = a(x - h)2 + k. Identify the vertex.f(x) = x2 + 6x - 4
A. f(x) = (x + 3)2 - 13; (-13, -3)
B. f(x) = (x + 6)2 - 40; (-40, -6)
C. f(x) = (x + 3)2 - 13; (-3, -13)
D. f(x) = (x + 6)2 - 40; (-6, -40)
Answer: C
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A. 
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D. 
Find an explicit formula for an.8, 9, 10, 11, 12, . . .
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? 
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