We are open Saturday and Sunday!

Call Now to Set Up Tutoring:

(888) 888-0446

Calculus 3 : Vectors and Vector Operations

Study concepts, example questions & explanations for Calculus 3

Create An Account

All Calculus 3 Resources

6 Diagnostic Tests 373 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #107 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix} 4&-9 \\-2 &-9 \end{vmatrix}$ and $b=\begin{vmatrix} -6\\-3 \end{vmatrix}$

Possible Answers:

$\begin{vmatrix} 13\\39 \end{vmatrix}$

$\begin{vmatrix} 3\\39 \end{vmatrix}$

$\begin{vmatrix} -6\\-48 \end{vmatrix}$

$\begin{vmatrix} -3\\-48 \end{vmatrix}$

$\begin{vmatrix} 4\\-12 \end{vmatrix}$

Correct answer:

$\begin{vmatrix} 3\\39 \end{vmatrix}$

Explanation:

In order to multiply two matrices, $A\times b$ , the respective dimensions of each must be of the form $m \times n$ and $n \times p$ to create an $m\times p$ (notation is rows x columns) matrix. Unlike the multiplication of individual values, the order of the matrices does matter.

$(A\times b \neq b \times A)$

For a multiplication of the form

$\begin{vmatrix} A_{1,1}&A_{1,2} &... &A_{1,n} \\ A_{2,1}&A_{2,2} &.. &A_{2,n} \\ ...& ...&... &... \\ A_{m,1}&A_{m,2} &... &A_{m,n} \end{vmatrix}\times \begin{vmatrix} b_{1,1}&b_{1,2} &... &b_{1,p} \\ b_{2,1}&b_{2,2} &... &b_{2,p} \\ ...&... &... &... \\ b_{n,1}&b_{n,2} &... &b_{n,p} \end{vmatrix}$

The resulting matrix is

$\begin{vmatrix} A_{1,1}b_{1,1}+A_{1,2}b_{2,1}+...+A_{1,n}b_{n,1}&... &A_{1,1}b_{1,p}+A_{1,2}b_{2,p}+...+A_{1,n}b_{n,p} \\ ...&... &... \\ A_{m,1}b_{1,1}+A_{m,2}b_{2,1}+...+A_{m,n}b_{n,1}&... &A_{m,1}b_{1,p}+A_{m,2}b_{2,p}+...+A_{m,n}b_{n,p} \end{vmatrix}$

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix} 4&-9 \\-2 &-9 \end{vmatrix}$ and $b=\begin{vmatrix} -6\\-3 \end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix} -24+27\\ 12+27\end{vmatrix}=\begin{vmatrix} 3\\39 \end{vmatrix}$

Report an Error

Example Question #101 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix} 6&-9 \\6 &-1 \end{vmatrix}$ and $b=\begin{vmatrix} 2\\ 3\end{vmatrix}$

Possible Answers:

$\begin{vmatrix} -3\\19 \end{vmatrix}$

$\begin{vmatrix} 20\\6 \end{vmatrix}$

$\begin{vmatrix} 14\\-5 \end{vmatrix}$

$\begin{vmatrix} 4\\5 \end{vmatrix}$

$\begin{vmatrix} -15\\9 \end{vmatrix}$

Correct answer:

$\begin{vmatrix} -15\\9 \end{vmatrix}$

Explanation:

$(A\times b \neq b \times A)$

For a multiplication of the form

The resulting matrix is

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix} 6&-9 \\6 &-1 \end{vmatrix}$ and $b=\begin{vmatrix} 2\\ 3\end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix} 12-27\\ 12-3\end{vmatrix}=\begin{vmatrix} -15\\9 \end{vmatrix}$

Report an Error

Example Question #109 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix} -9&-1 \\4 &-5 \end{vmatrix}$ and $b=\begin{vmatrix}-9\\-5 \end{vmatrix}$

Possible Answers:

$\begin{vmatrix} 36\\ 75\end{vmatrix}$

$\begin{vmatrix} 86\\ -11\end{vmatrix}$

$\begin{vmatrix} 43\\ -7\end{vmatrix}$

$\begin{vmatrix} 22\\ 19\end{vmatrix}$

$\begin{vmatrix} 19\\ 73\end{vmatrix}$

Correct answer:

$\begin{vmatrix} 86\\ -11\end{vmatrix}$

Explanation:

$(A\times b \neq b \times A)$

For a multiplication of the form

The resulting matrix is

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix} -9&-1 \\4 &-5 \end{vmatrix}$ and $b=\begin{vmatrix}-9\\-5 \end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix}81+5 \\-36+25 \end{vmatrix}=\begin{vmatrix} 86\\ -11\end{vmatrix}$

Report an Error

Example Question #110 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix} 0&-8 \\-7 &8 \end{vmatrix}$ and $b=\begin{vmatrix} 5\\5 \end{vmatrix}$

Possible Answers:

$\begin{vmatrix} -8\\5 \end{vmatrix}$

$\begin{vmatrix} -8\\-25 \end{vmatrix}$

$\begin{vmatrix} -40\\5 \end{vmatrix}$

$\begin{vmatrix} 16\\25 \end{vmatrix}$

$\begin{vmatrix} 16\\-5 \end{vmatrix}$

Correct answer:

$\begin{vmatrix} -40\\5 \end{vmatrix}$

Explanation:

$(A\times b \neq b \times A)$

For a multiplication of the form

The resulting matrix is

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix} 0&-8 \\-7 &8 \end{vmatrix}$ and $b=\begin{vmatrix} 5\\5 \end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix} 0-40\\-35+40 \end{vmatrix}=\begin{vmatrix} -40\\5 \end{vmatrix}$

Report an Error

Example Question #111 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix}-8 &1 &0 \\-8 &-5 &-9 \\2 &-7 &7 \end{vmatrix}$ and $b=\begin{vmatrix} 4\\-5 \\-8 \end{vmatrix}$

Possible Answers:

$\begin{vmatrix} -39\\-115 \\82 \end{vmatrix}$

$\begin{vmatrix} -23\\18 \\-42 \end{vmatrix}$

$\begin{vmatrix} 11\\-5 \\4 \end{vmatrix}$

$\begin{vmatrix} 86\\25 \\44 \end{vmatrix}$

$\begin{vmatrix} -37\\65 \\-13 \end{vmatrix}$

Correct answer:

$\begin{vmatrix} -37\\65 \\-13 \end{vmatrix}$

Explanation:

$(A\times b \neq b \times A)$

For a multiplication of the form

The resulting matrix is

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix}-8 &1 &0 \\-8 &-5 &-9 \\2 &-7 &7 \end{vmatrix}$ and $b=\begin{vmatrix} 4\\-5 \\-8 \end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix} -32-5+0\\-32+25+72 \\8+35-56 \end{vmatrix}=\begin{vmatrix} -37\\65 \\-13 \end{vmatrix}$

Report an Error

Example Question #112 : Matrices

Find the matrix product of $A\times b$ , where $A=\begin{vmatrix}9 &7 &9 \\7 &-5 &-6 \\-1 &3 &-9 \end{vmatrix}$ and $b=\begin{vmatrix} -7\\-7 \\8 \end{vmatrix}$

Possible Answers:

$\begin{vmatrix}-40 \\-62 \\-86 \end{vmatrix}$

$\begin{vmatrix}-40 \\-62 \\86 \end{vmatrix}$

$\begin{vmatrix}40 \\62 \\-86 \end{vmatrix}$

$\begin{vmatrix}-40 \\62 \\-86 \end{vmatrix}$

$\begin{vmatrix}40 \\62 \\86 \end{vmatrix}$

Correct answer:

$\begin{vmatrix}-40 \\-62 \\-86 \end{vmatrix}$

Explanation:

$(A\times b \neq b \times A)$

For a multiplication of the form

The resulting matrix is

The notation may be daunting but numerical examples may elucidate.

We're told that

$A=\begin{vmatrix}9 &7 &9 \\7 &-5 &-6 \\-1 &3 &-9 \end{vmatrix}$ and $b=\begin{vmatrix} -7\\-7 \\8 \end{vmatrix}$

The resulting matrix product is then:

$A\times b = \begin{vmatrix} -63-49+72\\-49+35-48 \\7-21-72 \end{vmatrix}=\begin{vmatrix}-40 \\-62 \\-86 \end{vmatrix}$

Report an Error

Example Question #701 : Vectors And Vector Operations

Calculate the determinant of .

$A=\begin{bmatrix} 1 & 3 \\ 2 & 4 \end{bmatrix}$

Possible Answers:

$\det(A)=1$

$\det(A)=2$

$\det(A)=-2$

$\det(A)=-1$

$\det(A)=0$

Correct answer:

$\det(A)=-2$

Explanation:

In order to find the determinant, we need to multiply the main diagonal components and then subtract the off main diagonal components.

$\det(A)=1(4)-(3)(2)=4-6=-2$

Report an Error

Example Question #704 : Vectors And Vector Operations

Find the product of the two matrices:

$\mathbf{A}\mathbf{B}$

Where

$\mathbf{A}=\begin{pmatrix} 3&1 \\ 2&-2 \end{pmatrix}$

and

$\mathbf{B}=\begin{pmatrix} -1&4 \\ 0&5 \end{pmatrix}$

Possible Answers:

$\begin{pmatrix} 5&10 \\ -9&-10 \end{pmatrix}$

$\begin{pmatrix} 3&-2 \\ 17&-2 \end{pmatrix}$

$\begin{pmatrix} -3&17 \\ -2&-2 \end{pmatrix}$

$\begin{pmatrix} 5&-9 \\ 10&-10 \end{pmatrix}$

Correct answer:

$\begin{pmatrix} -3&17 \\ -2&-2 \end{pmatrix}$

Explanation:

$\mathbf{AB}=\begin{pmatrix} 3&1 \\ 2&-2 \end{pmatrix}\textup{}$ $\begin{pmatrix} -1&4 \\ 0&5 \end{pmatrix}$

$=\begin{pmatrix} (3)(-1)+(1)(0)&(3)(4)+(1)(5) \\ (2)(-1)+(-2)(0)&(2)(4)+(-2)(5) \end{pmatrix}$

$=\begin{pmatrix} (-3+0)&(12+5) \\ (-2+0)&(8-10) \end{pmatrix}=\begin{pmatrix} -3&17 \\ -2&-2 \end{pmatrix}$

Report an Error

Example Question #115 : Matrices

Evaluate the following matrix operation:

$2\mathbf{A}+4\mathbf{B}$

where

$\mathbf{A}=\begin{pmatrix} 1&4 \\ -3&0 \end{pmatrix}, \, \;\mathbf{B}=\begin{pmatrix} 2&-2 \\ 1&-1 \end{pmatrix}$

Possible Answers:

$\begin{pmatrix} 8&12 \\ -10&-2 \end{pmatrix}$

$\begin{pmatrix} 10&0 \\ -2&-4 \end{pmatrix}$

$\begin{pmatrix} -6&16 \\ -10&4 \end{pmatrix}$

$\begin{pmatrix} -1&6 \\ -4&1 \end{pmatrix}$

$\begin{pmatrix} 2&-8 \\ -2&-1 \end{pmatrix}$

Correct answer:

$\begin{pmatrix} 10&0 \\ -2&-4 \end{pmatrix}$

Explanation:

$2\mathbf{A}+4\mathbf{B}=2\begin{pmatrix} 1&4 \\ -3&0 \end{pmatrix}+4 \begin{pmatrix} 2&-2 \\ 1&-1 \end{pmatrix}= \begin{pmatrix} 2&8 \\ -6&0 \end{pmatrix}+ \begin{pmatrix} 8&-8 \\ 4&-4 \end{pmatrix}$

$=\begin{pmatrix} 2+8&8-8 \\ -6+4&0-4 \end{pmatrix}= \begin{pmatrix} 10&0 \\ -2&-4 \end{pmatrix}$

Report an Error

Example Question #702 : Vectors And Vector Operations

Find the determinant of the matrix A:

$\mathbf{A}= \begin{pmatrix} 7&4 \\ 5&2 \end{pmatrix}$

Possible Answers:

-24

-6

Correct answer:

-6

Explanation:

The determinant of a matrix

$\begin{pmatrix} a&b \\ c&d \end{pmatrix}$

is defined as:

ad-bc

Here, that becomes:

(7)(2)-4(5)=14-20=-6

Report an Error

View Calculus 3 Tutors

Dalton
Certified Tutor

University of Massachusetts Amherst, Doctor of Philosophy, Mathematics.

View Calculus 3 Tutors

Fathima
Certified Tutor

BITS Pilani Goa, Doctorate (PhD), Mathematics.

View Calculus 3 Tutors

Wysheka
Certified Tutor

Clemson University, Doctorate (PhD), Engineering and Science Education.

All Calculus 3 Resources

6 Diagnostic Tests 373 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

Computer Science Tutors in Washington DC, Math Tutors in Houston, Biology Tutors in Dallas Fort Worth, ISEE Tutors in Chicago, Math Tutors in Phoenix, Computer Science Tutors in Dallas Fort Worth, SSAT Tutors in Phoenix, GRE Tutors in Seattle, Reading Tutors in Washington DC, GRE Tutors in Philadelphia

Popular Courses & Classes

MCAT Courses & Classes in Los Angeles, Spanish Courses & Classes in Atlanta, Spanish Courses & Classes in San Francisco-Bay Area, SAT Courses & Classes in Dallas Fort Worth, GRE Courses & Classes in Philadelphia, LSAT Courses & Classes in Boston, ACT Courses & Classes in Philadelphia, LSAT Courses & Classes in Denver, Spanish Courses & Classes in Dallas Fort Worth, GMAT Courses & Classes in Houston

Popular Test Prep

ISEE Test Prep in New York City, ISEE Test Prep in Houston, LSAT Test Prep in New York City, SSAT Test Prep in San Diego, ACT Test Prep in Dallas Fort Worth, LSAT Test Prep in Los Angeles, SAT Test Prep in Denver, LSAT Test Prep in Seattle, LSAT Test Prep in San Diego, SAT Test Prep in Boston

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

Calculus 3 : Vectors and Vector Operations

Study concepts, example questions & explanations for Calculus 3

All Calculus 3 Resources

Example Questions

Example Question #107 : Matrices

Example Question #101 : Matrices

Example Question #109 : Matrices

Example Question #110 : Matrices

Example Question #111 : Matrices

Example Question #112 : Matrices

Example Question #701 : Vectors And Vector Operations

Example Question #704 : Vectors And Vector Operations

Example Question #115 : Matrices

Example Question #702 : Vectors And Vector Operations

All Calculus 3 Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: