SOLUTION: Would someone please help? The surface area, A, of a cylinder in terms of its radius, r, and height, h, is given by A = 2πr^2 + 2πrh. If the height of the cylinder is 4

Question 1137748: Would someone please help?
The surface area, A, of a cylinder in terms of its radius, r, and height, h, is given by
A = 2πr^2 + 2πrh.
If the height of the cylinder is 4 feet, express the radius as a function of A.
r(A) =
Find the radius if the surface area is 350 square feet. (Round your answer to two decimal places.)
Found 2 solutions by josgarithmetic, MathLover1:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
(Some help only)

A = 2πr^2 + 2πrh

:

AMP Parsing Error of [r=(-8pi+- 2*sqrt(64pi^2+2A)/4]: Invalid expression. Closing bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 187. .

but not yet finished.
Needed restrictions are , and
.
.
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

The surface area, A, of a cylinder in terms of its radius,, and height, , is given by

If the height of the cylinder is feet, express the radius as a function of .
.....solve for

...........complete the square on left side
....

Find the radius if the surface area is square feet. (Round your answer to two decimal places.)

feet

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