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Solubility Product

Which of the ...

Question

Which of the functions defined below are NOT one-one function(s)

f (x) = 5 (x^{2} + 4), (x \in R)

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g (x) = 2 x + \frac{1}{x}

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h (x) = l n (x^{2} + x + 1), (x \in R)

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f (x) = e^{- x}

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Solution

The correct options are
A $f (x) = 5 (x^{2} + 4), (x \in R)$
B $g (x) = 2 x + \frac{1}{x}$
C $h (x) = l n (x^{2} + x + 1), (x \in R)$

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