Q. 23.8( 5 Votes )

Mark the correct alternative in the following:

If f : Q Q is defined as f(x) = x2, then f-1 (9)s is equal to

A. 3

B. -3

C. {-3, 3}

D. ϕ

Answer :


Replace f(x) by y,




Replace x by and y by x.



So,



Option C is correct.

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