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Question

If f:RR,f(x)=3x2 then (fof)(x)+2=

A
f(x)
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B
2f(x)
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C
3f(x)
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D
f(x)
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Solution

The correct option is D 3f(x)
fof(x)=f(f(x))
=f(3x2)
=3(3x2)2
=9x8
fof(x)+2=9x6=3(3x2)
=3f(x)

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