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Question

If f:RR,g:RR are defined by f(x)=4x1,g(x)=x3+2, then (gof)(a+14)=

A
43
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B
4a31
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C
a3+2
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D
64a38a21
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Solution

The correct option is C a3+2
g(f(a+14))=g(4(a+14)1)
=g(a)
=a3+2

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