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Which of the following is not a function in R, the set of real numbers ?

(A) $y=x^2$
(B) $y=\sqrt x$
(C) $y=x^3$
(D) $y=x$
Can you answer this question?
 
 

1 Answer

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$y=\sqrt x$ is not a function in R because negative numbers
do not have squareroot in R
answered May 21, 2013 by rvidyagovindarajan_1
edited May 18, 2014 by rohanmaheshwari0831_1
 

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