Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))
9th Edition
ISBN: 9780321962218
Author: Steven J. Leon
Publisher: PEARSON
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Chapter 3.6, Problem 25E
a.
To determine
To prove: That
b.
To determine
To prove: If
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Assume there is the following simplified grade book:
Homework Labs | Final Exam | Project
Avery
95
98
90
100
Blake
90
96
Carlos
83
79
Dax
55
30
228
92
95
79
90
65
60
Assume that the weights used to compute the final grades are homework 0.3, labs 0.2,
the final 0.35, and the project 0.15.
| Write an explicit formula to compute Avery's final grade using a single
inner product.
Write an explicit formula to compute everyone's final grade simultane-
ously using a single matrix-vector product.
1. Explicitly compute by hand (with work shown) the following Frobenius inner
products
00
4.56 3.12
(a) ((º º º). (156
(b)
10.9
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Chapter 3 Solutions
Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))
Ch. 3.1 - Consider the vectors x1=(8,6)T and x2=(4,1)T in R2...Ch. 3.1 - Repeat Exercise 1 for the vectors x1=(2,1)T and...Ch. 3.1 - LetC be the set of complex numbers. Defineaddition...Ch. 3.1 - Show that mn together with the usual additionand...Ch. 3.1 - Show that C[a,b] , together with the usual...Ch. 3.1 - LetP be the set of all polynomials. Show that P,...Ch. 3.1 - Show that the element 0 in a vector space...Ch. 3.1 - Let x, y, and z be vectors in a vector space V....Ch. 3.1 - Let V be a vector space and let xV . Show that (a)...Ch. 3.1 - Lei S be the set of all ordered pairs of real...
Ch. 3.1 - Let V be the set of all ordered pairs of real...Ch. 3.1 - Let R+ denote the set of positive real numbers....Ch. 3.1 - Let R denote the set of real numbers. Define...Ch. 3.1 - Let Z denote the set of ail integers with addition...Ch. 3.1 - LetS denote the set of all infinite sequences of...Ch. 3.1 - We can define a onetoone correspondence between...Ch. 3.2 - Determine whether the following sets form...Ch. 3.2 - Determine whether the following sets form sub...Ch. 3.2 - Determine whether the following are subspaces of...Ch. 3.2 - Determine the null space of each of the following...Ch. 3.2 - Determine whether the following are subspaces of...Ch. 3.2 - Determine whether the following are subspaces of...Ch. 3.2 - Show that Cn[a,b] is a subspace of C[a,b] .Ch. 3.2 - Let A be a fixed vector in nnandletSbethesetof all...Ch. 3.2 - In each of the following determine the subspace of...Ch. 3.2 - LetA be a particular vector in 22 ....Ch. 3.2 - Determine whether the following are spanning...Ch. 3.2 - Which of the sets that follow are spanning sets...Ch. 3.2 - Given x1=(123),x2=(342) x=(266),y=(925) Is...Ch. 3.2 - Let A be a 43 matrixand let b4 . Howmanypossible...Ch. 3.2 - Let A be a 43 matrixandlet c=2a1+a2+a3 (a) If...Ch. 3.2 - Let x1 be a particular solution to a system Ax=b...Ch. 3.2 - Let {x1,x2,...xk} be a spanning set for a vector...Ch. 3.2 - In 22 , let E11=(1000),E12=(0100)...Ch. 3.2 - Prob. 19ECh. 3.2 - Let S be the vector space of infinite...Ch. 3.2 - Prove that if S is a subspace of 1 , then either...Ch. 3.2 - Let Abe an nn matrix. Prove that the...Ch. 3.2 - Let U and V be subspaces of a vector space W.Prove...Ch. 3.2 - Let S be the subspace of 2 spanned by e1 and letT...Ch. 3.2 - Let U and V be subspaces of a vector space W....Ch. 3.2 - Let S, T, and U be subspaces of a vector space V....Ch. 3.3 - Determine whether the following vectors are...Ch. 3.3 - Determine whether the following vectors are...Ch. 3.3 - For each of the sets of vectors in Exercise 2,...Ch. 3.3 - Determine whether the following vectors are...Ch. 3.3 - Let x1,x2,...,xk be linearly independent vectors...Ch. 3.3 - Let x1,x2 , and x3 be linearly independent vectors...Ch. 3.3 - Let x1,x2 , and x3 be linearly independent vectors...Ch. 3.3 - Determine whether the following vectors are...Ch. 3.3 - Prob. 9ECh. 3.3 - Determine whether the vectors cosx,1 , and...Ch. 3.3 - Consider the vectors cos(x+) and sinx in C[,] ....Ch. 3.3 - Given the functions 2x and |x| , show that (a)...Ch. 3.3 - Prove that any finite set of vectors that contains...Ch. 3.3 - Let v1 and v2 be two vectors in a vector space...Ch. 3.3 - Prove that any nonempty subset of a linearly...Ch. 3.3 - Let Abe an mn matrix. Show that if A has linearly...Ch. 3.3 - Let x1,...,xk be linearly independent vectors in n...Ch. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Let v1,v2,...,vn be linearly independent vectorsin...Ch. 3.4 - In Exercise 1 of Section 3.3, indicate whether the...Ch. 3.4 - In Exercise 2 of Section 3.3, indicate whether the...Ch. 3.4 - Consider the vectors x1=(21),x2=(43),x3=(73) (a)...Ch. 3.4 - Given the vectors x1=(324),x2=(324),x3=(648) what...Ch. 3.4 - Let x1=(213),x2=(314),x3=(264) (a) Show that x1,x2...Ch. 3.4 - In Exercise 2 of Section 3.2, some of the sets...Ch. 3.4 - Find a basis for the subspace S of 4 consisting of...Ch. 3.4 - Given x1=(1,1,1)T and x2=(3,1,4)T : (a) Do x1 and...Ch. 3.4 - Let a1 and a2 be linearly independent vectors in 3...Ch. 3.4 - The vectors x1=(122) , x2=(254) , x3=(132) ,...Ch. 3.4 - Let S be the subspace of P3 consisting of all...Ch. 3.4 - In Exercise 3 of Section 3.2, some of the sets...Ch. 3.4 - In C[,] , find the dimension of the...Ch. 3.4 - In each of the following, find the dimension of...Ch. 3.4 - LetS be the subspace of P3 consisting of all...Ch. 3.4 - In 4 let U be the subspace of all vectors of the...Ch. 3.4 - Is it possible to find a pair of twodimensional...Ch. 3.4 - Show that if U and V are subspaces of n and UV=0 ,...Ch. 3.5 - For each of the following, find the transition...Ch. 3.5 - For each of the ordered bases u1,u2 in Exercise 1,...Ch. 3.5 - Let v1(3,2)T and v2(4,3)T . For each orderedbasis...Ch. 3.5 - Let E=[(5,3)T,(3,2)T] and let x=(1,1)T , y=(1,1)T...Ch. 3.5 - Let u1=(1,1,1)T,u2=(1,2,2)T , and u3=(2,3,4)T (a)...Ch. 3.5 - Let v1=(4,6,7)T,v2=(0,1,1)T , and v3=(0,1,2)T ,...Ch. 3.5 - Given v1=(12) , v2=(23) , S=(351 2) find vectors...Ch. 3.5 - Given v1=(26) , v2=(14) , S=(4121) find vectors u1...Ch. 3.5 - Let [x,1] and [2x1,2x+1] beorderedbasesfor P2 ....Ch. 3.5 - Find the transition matrix representing the...Ch. 3.5 - Let E={u1,...,un} and F={v1,...,vn} be two ordered...Ch. 3.6 - For each of the following matrices, find a basis...Ch. 3.6 - In each of the following, determine the dimension...Ch. 3.6 - Let A=(122314245549367859) (a) Compute the reduced...Ch. 3.6 - For each of the following choices of A and b,...Ch. 3.6 - For each consistent system in Exercise 4,...Ch. 3.6 - How many solutions will the linear system Ax=b...Ch. 3.6 - Let A be a 6n matrix of rank r and let b be a...Ch. 3.6 - Let Abe an mn matrix with mn . Let bRm and suppose...Ch. 3.6 - Let A and B be 65 matrices. If dimN(A)=2 ,what is...Ch. 3.6 - Let A be an mn matrix whose rank is equal to n. If...Ch. 3.6 - Let A be an mn matrix. Prove that rank(A)min(m,n)Ch. 3.6 - Let A and B be row equivalent matrices. (a) Show...Ch. 3.6 - Let A be a 43 matrixandsupposethatthevectors...Ch. 3.6 - Let A be a 44 matrix with reduced row echelonform...Ch. 3.6 - Let A be a 45 matrix and let U be the reduced row...Ch. 3.6 - Let A be a 58 matrix with rank equal to 5 and let...Ch. 3.6 - LetA bea 45 matrix, If a1,a2 , and a4 are...Ch. 3.6 - Let A be a 53 matrix of rank 3 and let {x1,x2,x3}...Ch. 3.6 - Let A be an mnmatrixwithrankequalton.Showthat if...Ch. 3.6 - Prove that a linear system Ax=b is consistent...Ch. 3.6 - LetAandBbemn matrices.Showthat...Ch. 3.6 - Let Abeanmn matrix. (a) Show that if B is a...Ch. 3.6 - Prove Corollary 3.6.4.Ch. 3.6 - Show that if A and B are nn matrices and N(AB)=n...Ch. 3.6 - Prob. 25ECh. 3.6 - Prob. 26ECh. 3.6 - Let x and y be nonzero vectors in m and n ,...Ch. 3.6 - Prob. 28ECh. 3.6 - Let Amn , Bnr , and C=AB . Show that (a) ifA and B...Ch. 3.6 - Prob. 30ECh. 3.6 - An mn matrix A is said to have a right inverse if...Ch. 3.6 - Prove: If A is an mn matrix and the column vectors...Ch. 3.6 - Show that a matrix B has a left inverse if and...Ch. 3.6 - Let B be an nm matrix whose columns arelinearly...Ch. 3.6 - Prob. 35ECh. 3.6 - Prob. 36ECh. 3 - (Change of Basis) Set U=round(20rand(4))10 ,...Ch. 3 - (RankDeficient Matrices) In this exercise we...Ch. 3 - (Column Space arid Reduced Row Echelon Form) Set...Ch. 3 - (Rank1 Updates of Linear Systems) (a) Set...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Prob. 5CTACh. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Prob. 10CTACh. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Answer each of the statements that follows as true...Ch. 3 - Prob. 14CTACh. 3 - Prob. 15CTACh. 3 - In 3 , let x1 and x2 be linearly independent...Ch. 3 - For each set that follows determine whether it is...Ch. 3 - Let A=(13134001110022200333) (a) Find a basis for...Ch. 3 - How do the dimensions of the null space and column...Ch. 3 - Answer the following questions and, in each case,...Ch. 3 - Let S be the set of all symmetric 22 matrices with...Ch. 3 - Let A be a 64 matrix of rank 4. (a) What is the...Ch. 3 - Given the vectors x1=(122),x2=(133) ,...Ch. 3 - Let x1,x2 and x3 be linearly independent vectors...Ch. 3 - Let A be a 65 matrix with linearly independent...Ch. 3 - Let {u1,u2} and {v1,v2} be ordered bases for 2 ,...
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