SOLUTION: If f(x) = log3 (x + 1), what is f−1(2)? A) 1 B) 8 C) 10 D) 27

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Question 844373: If f(x) = log3 (x + 1), what is f−1(2)?
A) 1
B) 8
C) 10
D) 27

Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!



Change f(x) to y



Interchange x and y



Use the principle that  is equivalent to  



Solve for y:



Replace y by f-1(x)

f-1(x) = 3x - 1 

So substitute x=2

f-1(2) = 32 - 1 = 9 - 1 = 8

Edwin
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