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The function $f:\mathbb{R}\to\mathbb{R}$ given by $f(x) = x^2$ is:
Aone-one and onto
Bone-one but not onto
Conto but not one-one
Dneither one-one nor onto
Answer & Solution
Correct answer: D. neither one-one nor onto
x² gives f(−a)=f(a) (not one-one) and never negative values (not onto on ℝ) — neither.
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