1. Let f be a differentiable function everywhere and let p be a constant. Define a function g by g(x) = px - f(x). Geometrically, g measures the vertical distances between the graph of f and the straight line, y = pr. We want to understand when g has extrema, that is, the largest or smallest vertical distances between the graph of the function f and a straight line. Prove that if g has an extremum value at x =c then f must have a tangent line parallel to the line y = px.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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1. Let f be a differentiable function everywhere and let p be a constant.
Define a function g by g(x) = px - f(x). Geometrically, g measures the vertical distances
between the graph of f and the straight line, y = pr. We want to understand when g
has extrema, that is, the largest or smallest vertical distances between the graph of the
function f and a straight line.
Prove that if g has an extremum value at x = c then f must have a tangent line parallel
to the line y = px.
Transcribed Image Text:1. Let f be a differentiable function everywhere and let p be a constant. Define a function g by g(x) = px - f(x). Geometrically, g measures the vertical distances between the graph of f and the straight line, y = pr. We want to understand when g has extrema, that is, the largest or smallest vertical distances between the graph of the function f and a straight line. Prove that if g has an extremum value at x = c then f must have a tangent line parallel to the line y = px.
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