Find the domain of the rational expression. 
A. {x|x is a real number and x ? -9}
B. {x|x is a real number and x ? 9 and x ? 0}
C. {x|x is a real number and x ? 9 and x ? 0 and x ? 2 }
D. {x|x is a real number and x ? -9 and x ? 0}
Answer: D
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x = 5
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