The graph of an exponential function of the form  f(x) = abx  passes through  (1, 2)  and  (2, 1).  Find  f(−2).   f(−2) =

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.2: Exponential Functions
Problem 31E
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The graph of an exponential function of the form 

f(x) = abx

 passes through 

(1, 2)

 and 

(2, 1).

 Find 

f(−2).

 

f(−2) =
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