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what is the domain of function f (x) =5 √x+9 a. (-9, ∞] b. [-9, ∞) c. [-9, ∞] d. (-9, ∞)
The function is defined for the value x = -9, so the domain includes that value. The bracket for -9 will be a square bracket, since the value is included in the domain.
The bracket for infinity is always a round bracket.
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