Suppose ƒ(x, y) is continuous and nonnegative over a region R inthe plane with a defined area A(R). If 4R ƒ(x, y) dA = 0, provethat ƒ(x, y) = 0 at every point (x, y)R.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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Suppose ƒ(x, y) is continuous and nonnegative over a region R in
the plane with a defined area A(R). If 4R ƒ(x, y) dA = 0, prove
that ƒ(x, y) = 0 at every point (x, y)R.

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