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If (f:[a,\infty)\to\mathbb{R}) and (f(x)=x^2), which condition on (a) is necessary and sufficient for (f) to be one-one?

Answer and explanation

Correct answer: (a\ge0)

Step 1: (x^2) increases to the right of zero and can give the same value on both sides of zero. Step 2: If (a\ge0), the whole domain stays to the right of zero, so two different inputs do not give the same value. Step 3: For a quadratic function the domain should lie on one side of the vertex.

Related tags

ParameterRestricted DomainSquare FunctionOne-One FunctionOne One FunctionRelations And FunctionsMathematicsClass 12 Mcq

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