The height of the cylinder is 4 inches.    A. Find the inverse function to A(r). your answer should look like r = "some expression involving A" r(A) =    Hints: to calculate an inverse function, you need to solve for r. here you could start with A=2(pi)r^2+8(pi)r. this equation is the same as  2(pi)r^2+8(pi)r-A = 0 where the variable x is r?  you can solve for r using the quadratic formula even though the constant term c is a symbol here

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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The height of the cylinder is 4 inches. 

 

A. Find the inverse function to A(r). your answer should look like r = "some expression involving A"

r(A) = 

 

Hints: to calculate an inverse function, you need to solve for r.

here you could start with A=2(pi)r^2+8(pi)r. this equation is the same as 

2(pi)r^2+8(pi)r-A = 0 where the variable x is r? 

you can solve for r using the quadratic formula even though the constant term c is a symbol here

 

I am stuck, and cannot figure this out. 

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