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Question
Answer the following:
Find whether the following function is one-one
f : R → R defined by f(x) = x2 + 5
Solution
f : R → R defined by f(x) = x2 + 5
∵ f(– x) = f(x) = x2 + 5
∴ f is not one-one (i.e. many-one) function.
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