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Question

The range of f(x)=x2+4x+29 is

A
(,)
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B
(0,)
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C
[5,)
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D
(0,5)
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Solution

The correct option is B [5,)
f(x)=x2+4x+29
=x2+4x+4+25
=(x+2)2+52
(x+2)20
5f(x)<

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