Question: is f(x) = log(x) + sqrt x the same function as g(u) = log(u) + sqrt u ? do they both have the same range?

is f(x) = log(x) + sqrt x the same function as g(u) = log(u) + sqrt u ?

do they both have the same range? do they both have the same domain?

If x and u are different numbers then are they different functions?

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