Are the following functions from R to R? If not, explain why a) f(x) = 1/x b) f(x) = 2x + 7
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Let us check whether the following correspondings are the functions from to
a)
Since is not defined for , and for each the value is uniquely determined, we conclude that is a function from to but is not a function from to
b)
Since for each the value is uniquely determined, we conclude that is a function from to