Express the function in the form f(x) = a(x - h)2 + k and indicate the vertex.f(x) = x2 - 8x - 9
A. f(x) = (x - 4)2 - 57
vertex: (4, -57)
B. f(x) = (x + 4)2 + 39
vertex: (-4, 39)
C. f(x) = (x + 8)2 + 119
vertex: (-8, 119)
D. f(x) = (x - 4)2 - 25
vertex: (4, -25)
Answer: D
Mathematics
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