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jeff100 jeff100
  • 07-07-2016
  • Mathematics
Answered

If ƒ(x ) = 3x + 1 and ƒ -1 = , then ƒ -1(7) =

Verified Answer :

olemakpadu
olemakpadu olemakpadu
  • 09-07-2016

f(x) = 3x + 1

let f(x) = y

y = 3x + 1

y - 1 = 3x

3x = y - 1

x = (y - 1)/3

From y = f(x),  x = f⁻¹(y) 

x = (y - 1)/3

 f⁻¹(y)  = (y - 1)/3

f⁻¹(7)  = (7 - 1)/3 = 6/3 = 2

f⁻¹(7) = 2

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