Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 3 - Linear and Quadratic Functions - 3.3 Quadratic Functions and Their Properties - 3.3 Assess Your Understanding - Page 147: 84

Answer

$(2,3)$.

Work Step by Step

Step 1. Let the point be $P(x,y)$, we have $y=x+1$ since it is on the line. Step 2. Its distance $(d)$ to $(4,1)$ satisfies $d^2=(x-4)^2+(y-1)^2=(x-4)^2+(x)^2$ Step 3. Let $f(x)=(x-4)^2+(x)^2=2x^2-8x+16$ Step 4. The minimum of $f(x)$ happens when $x=-\frac{-8}{2(2)}=2$, thus we have $P(2,3)$.
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