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If `f: (R) rarr (R)` and `g (R) rarr (R)` defined by `f(x)=2x+3`and`g(x)=x^(2)+7`,then the values of x such that `g(f(x))=8`are

A

1)1,2

B

2)-3

C

3)-3

D

4)-1,-2

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The correct Answer is:
C
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