1.

Let= [1, inftY). Define f :S to S by f(x) = 5^(x(x+1)) Then f^(-1)(x) is equal to

Answer»

`(1/5)^(x(x-1))`
`1/2[ 1+ SQRT(log_(5)(x))]`
`1/2[1+ sqrt(1+4 log_(5)(x))]`
`(1/5)^(x(1-x))`

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