Solve.Given f(x) = x2 - 18x + 68, find all values for x for which f(x) ? 0.
A. (-?, 9 - 
] ? [9 + 
, ?)
B. (-?, -
] ? [
, ?)
C. [9 - 
, 9 + 
]
D. (-?, 9 - 
) ? (9 + 
, ?)
Answer: A
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