SOLUTION: The area of a circle is given by the expression 3.14(4x+36x+81) what expression represents the diameter of this circle ?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: The area of a circle is given by the expression 3.14(4x+36x+81) what expression represents the diameter of this circle ?      Log On


   

Question 974609: The area of a circle is given by the expression 3.14(4x+36x+81) what expression represents the diameter of this circle ?
Answer by Alan3354(69443) About Me  (Show Source):
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The area of a circle is given by the expression 3.14(4x+36x+81) what expression represents the diameter of this circle ?
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Area+=+pi%2Ar%5E2+=+pi%2A%284x+%2B+36x+%2B+81%29+=+pi%2A%2840x+%2B+81%29
r%5E2+=+sqrt%2840x+%2B+81%29
r+=+sqrt%2840x+%2B+81%29
d+=+2r+=+2sqrt%2840x+%2B+81%29