A) \[\phi \]
B) \[\{5,\,\,\,-5\}\]
C) \[\{4,\,\,\,-4\}\]
D) \[\{2,\,\,\,-4\}\]
Correct Answer: B
Solution :
Let \[y=f(x)={{x}^{2}}+4\] \[\Rightarrow \] \[{{x}^{2}}=y-4\] \[\Rightarrow \] \[x=\sqrt{y-4}\] \[\therefore \] \[{{f}^{-1}}(x)=\pm \sqrt{29-4}=\pm 5\]You need to login to perform this action.
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