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Question

Range of the function f(x)=x2+x+2x2+x+1:xR is


A
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B
( 1 , 11/ 7]
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C
( 1 , 7 / 3]
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D
( 1, 7/5]
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Solution

The correct option is C ( 1 , 7 / 3]

f(x) can also be written as:
f(x)=1+1(x+12)2+34 Range = (1,73).


Mathematics

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