Example Video Example Find the scalar projection and vector projection of b = (4, 1, 1) onto a = (-1, 3, 4). Solution Since |al = V(-1)² + 32 + 42 = V26, the scalar projection of b onto a is a· b (-1)(4) + 3(1) + 4(1) comp,b |a| 26 The vector projection is this scalar projection times the unit vector in the direction of a, below. proj,b = |a|

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.3: Lines
Problem 23E
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Example
Video Example
Find the scalar projection and vector projection of b = (4, 1, 1) onto a = (-1, 3, 4).
Solution
Since Jal = V(-1)2 + 32 + 42 = V26, the scalar projection of b onto a is
%3D
a · b
(-1)(4) + 3(1) + 4(1)
compab
|al
V 26
The vector projection is this scalar projection times the unit vector in the direction of a, below.
a
projąb =
|a|
Transcribed Image Text:Example Video Example Find the scalar projection and vector projection of b = (4, 1, 1) onto a = (-1, 3, 4). Solution Since Jal = V(-1)2 + 32 + 42 = V26, the scalar projection of b onto a is %3D a · b (-1)(4) + 3(1) + 4(1) compab |al V 26 The vector projection is this scalar projection times the unit vector in the direction of a, below. a projąb = |a|
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