Q.
Let f:(4,6)→(6,8) be a function defined by f(x) =x+[x2] (where [.] denotes the greatest integer function), then f−1(x) is equal to
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a
x−[x2]
b
−x−2
c
x−2
d
1x+[x2]
answer is C.
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Detailed Solution
Since f:(4,6)→(6,8)⇒ f(x)=x+2 ∴ f−1(x)=x−2 .
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