A Distance Between Curves

Problem

Given

ln⁡a−ln⁡3=ln⁡c,bd=−3,\ln a - \ln 3 = \ln c, \qquad bd = -3,

find the minimum value of (a−b)2+(c−d)2(a - b)^2 + (c - d)^2.

Answer

Solution

Difficulty7/10
Topicsalgebra, Logarithms, AM-GM, analytic geometry, inequality

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