Part a: Assume that the height of your cylinder is 8 inches. Consider A as a function of r, so we can write that as A(r)=2πr2+16πr. What is the domain of A(r)? In other words, for which values of r is A(r) defined?

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Part a: Assume that the height of your cylinder is 8 inches. Consider A as a function of r, so we can write that as A(r)=2πr2+16πr. What is the domain of A(r)? In other words, for which values of r is A(r) defined?

 

Part b: 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=2πr2+16πr. This equation is the same as 2πr2+16πr−A=0. Do you recognize this as a quadratic equation ax2+bx+c=0 where the variable x is r? The coefficients would be 2π for a, 16π for b, and −A for c.
  • You can solve for r using the quadratic formula even though the constant term c is a symbol here.

 

Part c: If the surface area is 225 square inches, then what is the radius r? In other words, evaluate r(225). Round your answer to 2 decimal places.

Need Part A

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