8/x+21  How do I find the followings?  f (a) = f (a) + f (h) = f (a + h) =

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 3E
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f(x)= 8/x+21 

How do I find the followings? 

f (a) =

f (a) + f (h) =

f (a + h) =

f (a + h) − f (a)/h= 

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