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choixongdong
When f(x) = 4 then x = 2 (domain = 2, range = 4)

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From the mapping above it can be seen that the given relationship is bijective (one-to-one and onto or one-to-one correspondence) as each element of the range is mapped to by exactly one element of the domain. So f(x)=4 implies f(2)=4 or simply x=2