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If no, then in some book that have said to Find domain for given function, like f(x) = sqrt(4-7x), if x=0, then f(x)=-2 or +2
If function is single valued. It will not give back 2 or more results for the same input.
f(x) = sqrt( x ) for example is also must not be a function right? If i plug in 2, f(2) = +2 or -2
In most book i found similar to this...
just what i have said!
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