Find the vertex and axis of symmetry of the graph of the function.f(x) = x2 + 6x

A. (9, -3); x = 9
B. (3, -9); x = 3
C. (-9, 3); x = -9
D. (-3, -9); x = -3


Answer: D

Mathematics

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A.  
B.
C.  
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What will be an ideal response?

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