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What is the functions domain ?
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What is the functions domain ?

What is the functions domain ?-example-1
User MatTheCat
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f(x)=x+5;\ y\in\{7;\ 9\}\\\\x+5=7\ \ \ |-5\\x=2\\\\x+5=9\ \ \ |-5\\x=4\\\\\text{The domain is:}\ \{2;\ 4\}
User Nova Entropy
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