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Question

Find the domain of the following function :

f(x)=4x2

A
[1,1]
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B
(,)
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C
[2,2]
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D
None of these
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Solution

The correct option is B [2,2]
f(x)=4x2
Clearly, f(x) assumes real values for all x satisfying
4x20
(x24)0
x240
(x2)(x+2)0
x[2,2]
Hence, Domain (f) = [2,2]

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