Test Academy | Which of the following functions from Z into Z are bijective? f(x) = x³, f(x) = x + 2, f(x) = 2x + 1, f{x) = x² + 1

Question

Which of the following functions from Z into Z are bijective?

Options :

f(x) = x³
f(x) = x + 2
f(x) = 2x + 1
f{x) = x² + 1

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