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Question

If f:RR is defined by f(x)=x23x+2, then f(x23x2)=

A
x4+1
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B
x43x+2
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C
x46x3+2x2+21x+12
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D
x4+2x+2
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Solution

The correct option is B x46x3+2x2+21x+12
f(x23x2)=(x23x+2)23(x23x+2)+2
x4+9x2+46x312x+4x23x2+9x6+2
=x46x3+2x2+21x+12

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