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Maths Test 3 - Review
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23
Mathematics
11th Grade
03/20/2012

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Term
What do you write when excluding no.s from a pronumeral.
Definition
x is an element of the real field \(y,z) etc
Term
Infinite or no solutions
Definition
det=0
Term
Unique solution
Definition
-Will be one off depending on the values of the unknown pronumerals. Not infinite (lines lie on eachother) or no solution (parallel).

det does not = 0
Term
det(a)
Definition
det= ac-bd
Term
What to remember when getting an inverse
Definition
swap a and d, and negate b and c.
Term
Identity Matrix
Definition
Also called a unit matrix.

10
01

or

100
010
001

If you multiply the identity matrix by a square matrix you will get the same result as the square matrix.
A matrix must be square matrix for identity to exist.

AI=IA=A
Term
Zero matrix
Definition
A matrix of any order with all zeros.

00

00
00

000
000
000

0000
Term
Scalar Multiplication
Definition
Involves multiplying a whole matrix by a number (similiar to a bracket in algebra.

eg.

k 12
34

= k 2k
3k 4k
Term
How are matrices equal
Definition
Same order (dimension 2x2 etc.)
Identical values in each element
Term
An element in matrices
Definition
1,2 (1st row, 2nd column etc.)

Basically referring to one of the values (no.s) in the matrix.
Term
Adjancency Matrix
Definition
A loop in a network responds to a value of 1 is an adjancency matrix.

Eg.

The rows are one factor compared to the columns which is another factor. (x,y. cost, time. etc.)
Term
Order of a matrix
Definition
Dimensions
Term
Column and row matrix
Definition
Forms a column shape or row shape
Term
Types of matrices
Definition
Square Matrix
Singular Matrix
Column Matrix
Regular Matrix
Row Matrix
Term
AB does NOT = BA

*Unless identity matrix

True or false
Definition
True
Term
Matrices must be square matrices to be raised to a power
Definition
True
Term
Regular Matrix
Definition
det does NOT = 0

compared to a singular matrix where det does =0
Term
Singular Matrice
Definition
det does = 0

No solution (parallel) or infinite many solutions (same equation)
Term
No solution and Infinite many solution notes
Definition
No solution means - parallel different y int
Infinite many solution means - same equation (same line)
Term
If it asks for acute
Definition
Subtract it from 180 degrees.
Term
Tan 30 degrees
Definition
1/root(3) or root(3)/3
Term
Tan 45 degrees
Definition
1
Term
Tan 60 degrees
Definition
root(3)
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