1. Proof the remaining Dot product properties Let a = (1,2, –3), b = (0, 2, 4), and c = (5, –1,3). Find each of the following products. a. (a · b)c b. а (2с) c. ||b||²
1. Proof the remaining Dot product properties Let a = (1,2, –3), b = (0, 2, 4), and c = (5, –1,3). Find each of the following products. a. (a · b)c b. а (2с) c. ||b||²
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
Related questions
Question
Answer number 1

Transcribed Image Text:Dot product
Proof
Let u = (u1, u2, u3) and v = (v1, v2, V3). Then
u v = (u1, u2, u3) · (v1, v2, V3)
= u1 v1 + uz v2+u3 V3
= vịu1 + v2u2 + v3U3
= (v1, v2 , V3) · (u1 , u2, u3)
= v. u.
c(u. v) = c(u vị +u2v2 +u3v3)
= c(u,v1)+c(uzva)+c(uzv3)
= (cui )v1 + (cu2)v2 + (cu3)v3
= (cu1, cu2, cu3) · (v1, v2, V3)
= c{u, uz, us) · (v1, v2, v3)
= (cu) - v.
Dot product
Exercises
1. Proof the remaining Dot product properties
Let a = (1,2, –3), b = (0, 2,4), and ĉ = (5, –1,3).
Find each of the following products.
а. (а Б)с
b. a · (2c)
c. ||b||2
Dot product
Using the Dot Product to Find the Angle between Two Vectors
When two nonzero vectors are placed in standard position, whether in two dimensions or three dimen
between them (Figure 11.3.1). The dot product provides a way to find the measure of this angle. This
fact that we can express the dot product in terms of the cosine of the angle formed by two vectors.
Figure 11.3.1: Let 0 be the angle between two nonzero vectors ū and v such that 0 <0
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