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Consider the function \(f:\mathbb{R}\to\mathbb{R}\) defined by \(f(x)=x^2\). Which statement is correct from the function point of view?

Answer and explanation

Correct answer: The function \(f(x)=x^2\) is not one-one because \(f(2)=f(-2)\).

To check one-one, look for different inputs with the same output. \(f(2)=2^2=4\) and \(f(-2)=(-2)^2=4\). Since \(2\neq -2\) but \(f(2)=f(-2)\), the function is not one-one. Hence option (B) is correct.

Related tags

FunctionsOne-OneInjectiveClass 11

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