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Which of the following fucntions are bijections ?

Option 1)
f(x) =|x|

Option 2)
f(x) = $x^4$

Option 3)
f(x) =sgn x

Option 4)
f(x) = x

Answers (1)

best_answer

As we have learned @1424

only f(x) = x is onto both one-one and onto

Option 1)

f(x) =|x|

Option 2)

f(x) = $x^4$

Option 3)

f(x) =sgn x

Option 4)

f(x) = x

Posted by

Himanshu

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