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Question

If f:R{2}R is a function defined by f(x)=x24x2, then its range is

A
R
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B
R{2}
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C
R{4}
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D
R{2,2}
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Solution

The correct option is C R{4}
Given function is f(x)=x24x2,
As the domain does not include 2 we can simplyfy,
f(x)=x+2,
x can take any real value in the domain,
So,the range is R{4},
As is x+2=4x=2 which is not in the domain.

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