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Question

Find the range of the function f(x)=x24x2 for x2 .

A
R
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B
R{0}
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C
R{2}
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D
R{4}
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Solution

The correct option is D R{4}
Given, f(x)=x24x2 for x2
Therefore, f(x)=(x+2)(x2)x2=x+2 for x2
When x2, f(2)=4 not possible.
Range is R{4}

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