Suppose f is a differentiable function on an interval II and f(x) 6= 0 for every x in the interval. Prove that f(x) and xf(x) are linearly independent on II.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.2: Exponential Functions
Problem 58E
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Suppose f is a differentiable function on an interval II and f(x) 6= 0 for every x in the interval.

Prove that f(x) and xf(x) are linearly independent on II. 

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