C HAPTER 4 S ECTION 3
M ATRIX M ULTIPLICATION
CH 12 N OTEBOOK Q UIZ
1. What is the definition of a Permutation?
(Sec 6.7; Feb 10)
2. What was the answer to Warm-Up
question #2 on February 11th? (Sec 6.8)
3. What is the formula used to find the
probability of two events that are not
mutually exclusive? (Sec 9.7; Feb 12)
4. What does the third quartile represent in a
box-and-whisker plot? (Sec 12.3; Feb 13)
N OTEBOOK Q UIZ A NSWERS
1. An arrangement of items in a particular
order
2.
3.
4. The median of the upper half of the data set
S CALAR M ULTIPLICATION

Scalar Multiplication: Multiplies a matrix
A by a scalar c

Evaluate the following equation:
scalar
Matrix A
S CALAR M ULTIPLICATION

Find the difference 5A – 3B for the
following matrices:
S OLVING M ATRIX E QUATIONS

Solve the following equation for the
matrix X:
M ATRIX M ULTIPLICATION

Matrix Multiplication: Multiply the rows of the first
matrix by the columns of the second matrix

Reading from left to right, the “inside” dimensions must
be the same in order to multiply
3X 2
2 X3
Same!!
M ATRIX M ULTIPLICATION

Determine if the product of the following
two matrices is defined or undefined. If it is
defined, find the product.
M ATRIX M ULTIPLICATION

Determine whether the products RS and SR
are defined or undefined

Find each defined product
H OMEWORK #30
 Page 186 #1, 6, 9, 11, 14,
17, 19, 22-26, 46a