Unit 2 Notes Scavenger Hunt

Unit 2 Notes Scavenger Hunt

by CAITLIN HAIG

​Step 1: Organize Your Notebook

​Make sure you have all your notes in your binder - filled in & in order

​2.1 - Matrix Basics

​2.2 - Multiplying Matrices (Part 1)

​2.3 - Multiplying Matrices (Part 2)*

​2.4 - Solving Systems Using Matrices

​2.5 - Determinants of Matrices

​2.6 - Determinant Applications

​2.7 - Matrix Inverses

​2.8 - Solving Systems Using Matrices

​Step 2: Scavenger Hunt Questions

​Once you have your binder organized, make a note of any missing pages.

​Then, hit next and answer the following questions using your notes.

ALL answers can be found in your notes - the section number will be listed.

Multiple Choice

Section 2.1

Fill in the blank: Two matrices must be the _______ in order to be added or subtracted.

• exact same size

• # of columns in first matrix match the # of rows in second

• # of rows in first matrix match the # of columns in second

• square

Multiple Choice

Section 2.1

Matrix dimensions are listed as . . .

• row x column

• column x row

• left x right

• up x down

Multiple Choice

Section 2.1

What operation is this the definition for?

cA is the  matrix obtained by multiplying all entries of A by c

• addition

• subtraction

• scalar product

• multiply

Multiple Choice

Section 2.2

Fill in each blank (in order):

To multiply matrices, you multiply each ___ of the first matrix by each ____ of the second one.

• row , column

• column , row

• column, column

• row , row

Multiple Choice

Section 2.2

Multiplying matrices only works if the ________  dimensions match.

• row

• column

• inside

• outside

Multiple Choice

Section 2.

What is the matrix that your calculator gives you that shows the answers called?

• augmented

• scalar

• rref

• solution

Multiple Choice

Section 2.4

What is the matrix called that is formed directly from the equations of a system?

• augmented

• scalar

• rref

• solution

Multiple Choice

Section 2.4

Which of the options below shows the bottom row of a matrix with no solution?

• [ 0  0  0]

• [ 0  0  1]

• [ 0  1  0]

• [ 0  1  1]

Multiple Choice

Section 2.4

Which of the options below shows the bottom row of a matrix with infinite solutions?

• [ 0  0  0]

• [ 0  0  1]

• [ 0  1  0]

• [ 0  1  1]

Multiple Choice

Section 2.5

Fill in the blank:Only ____ matrices have determinants.

• 2x2

• 3x3

• 2x3

• square

Multiple Choice

Section 2.5

Which is not an example of something the determinant can help you find?

• Inverse Matrices

• Area of a Triangle

• Cramer's Rule

• Matrix Multiplication

Multiple Choice

Section 2.5

What is the determinant of a 2x2?

• ad - bc

• ab - cd

• ad + bc

• ab + cd

Multiple Choice

Section 2.5

When finding the determinant of a 3x3, what is the first step?

• Copy the first two columns

• Add a column of all 1's

• Multiply each diagonal

• Subtract the diagonal products

Multiple Choice

Section 2.6

When finding the area of a triangle, what do you need to add to make the matrix 3x3?

• Delete the last column

• Add a column of all 1's

• Multiply each diagonal

• Add a row of all 1's

Multiple Choice

Section 2.6

 What size of matrices do you find the determinant of when using Cramer’s Rule?

• 2x2

• 3x3

• 2x3

• 3x2

Multiple Choice

Section 2.7

 Instead of dividing matrices, we

• Multiply by the inverse

• Subtract the matrices

• Multiply by 1/2 

• Just get rid of the matrix we don't want.

Multiple Choice

Section 2.7

Which equation needs an inverse to be solved?

Multiple Choice

Section 2.7

 Which equation does not need an inverse to be solved?

Multiple Choice

Section 2.7

Fill in the blank: Matrices with determinants = ___ do not have inverses

• 0

• 1

• a positive #

• a negative #

Multiple Choice

Section 2.8

Which is not one of the methods used to solve systems?

• Elimination

• Graphing

• Matrices

• Opposite Operations