42. f(x) = ;a = 2 %3D Зх— 1

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter2: Functions And Graphs
Section2.6: Proportion And Variation
Problem 17E: Find the constant of proportionality. y is directly proportional to x. If x=30, then y=15.
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 For the following functions and values of a, find ƒ′(a).
b. Determine an equation of the line tangent to the graph of ƒ at the
point (a, ƒ(a))for the given value of a.

42. f(x) =
;a = 2
%3D
Зх— 1
Transcribed Image Text:42. f(x) = ;a = 2 %3D Зх— 1
Expert Solution
Step 1

Given function is fx=13x-1.

Given value of a=2.

So, at a=2 we have

fa=13·a-1=13·2-1=15

So, given point is 2,15

 

Step 2

(a) Differentiating the given function with respect to x, we get

f'x=ddx13x-1=ddx3x-1-1=-13x-1-1-1·3=-33x-12

Now, we have to find f'a where a=2

f'a=-33a-12f'2=-33·2-12                Since a=2f'2=-325

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