Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 1 - Section 1.9 - Distance and Midpoint Formulas; Circles - Exercise Set: 29

Answer

$\text{midpoint} = (2\sqrt{2}, 0)$

Work Step by Step

Simplify $\sqrt{18}$ to obtain: $\sqrt{18} = \sqrt{9(2)} = \sqrt{3^2(2)} = 3\sqrt{2}$. Thus, the first point is the same as the point $(3\sqrt{2}, -4)$ RECALL: The midpoint of the line segment whose endpoints are $(x_1, y_1)$ and $(x_2, y_2)$ can be found using the midpoint formula: $\text{midpoint}=\left(\dfrac{x_1+x_2}{2}, \dfrac{y_1+y_2}{2} \right)$ Use the formula above to obtain: $\text{midpoint} = \left(\dfrac{3\sqrt{2}+\sqrt{2}}{2}, \dfrac{-4+4}{2}\right)=\left(\dfrac{4\sqrt{2}}{2}, \dfrac{0}{2}\right) \\\text{midpoint} = (2\sqrt{2}, 0)$
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