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Question

The maximum of f(x)=2x39x2+12x+4 occurs at x=

A
1
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B
2
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C
-1
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D
-2
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Solution

The correct option is A 1
f(x)=6x218x+12
=6(x23x+2)
=6(x2)(x1)
f(x)>0 If x>2 or x<1
f(x)<0 If xϵ(1,2)
So f(x) is max at x=1

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