Q.

If f(x)=5log5⁡x 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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If f(x)=5log5⁡x then f−1(α−β) where α,β∈R is equal to