document.write( "Question 907354: The inverse of the function y = x2 is still a function.
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Algebra.Com's Answer #550253 by Fombitz(32388) $\"\"$ $\"About$

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Never.
\n" ); document.write( "A function has one unique y value for each x value.
\n" ); document.write( "Since $\"y=x%5E2\"$ gives one y value for two different x values (x and -x), the inverse would give two y values for a given x value and that violates the definition of a function.
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