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To make f(x) = x² one-to-one, its domain can be restricted to
A|x| ≤ 1
Bx ≤ 5
Cx ≥ 0
Dall reals
Answer & Solution
Correct answer: C. x ≥ 0
On x ≥ 0 the square is strictly increasing, so no two inputs share an output.
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