why is the co-domain of this any real number?

Christine C

New member
y =?(x - 6)

I got f: [6, ?) -> [0, ?), f(x) = ?(x - 6) but the given answer is:

f: [6, ?) -> R, f(x) = ?(x - 6)

How can y be any real number when the minimum value that you can get is 0?
how is k in y^kx equal to 1/k? i think i'm after the proof
 
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