Q.
If f(x)=5log5x then f−1(α−β) where α,β∈R is equal to
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a
f−1(α)−f−1(β)
b
f−1(α)f−1(β)
c
1f(α−β)
d
1f(α)−f(β)
answer is B.
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Detailed Solution
let fx = 5 logx 5 =y ⇒log x 5 =y5⇒x =5y5 therefore f-1x=5x5 ⇒f-1α-β=5α-β5=5α55β5=f-1αf-1β
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