2. MATRIX:MATRIX: A rectangularA rectangular
arrangement ofarrangement of
numbers in rows andnumbers in rows and
columns.columns.
TheThe ORDERORDER of a matrixof a matrix
is the number of theis the number of the
rows and columns.rows and columns.
TheThe ENTRIESENTRIES are theare the
numbers in the matrix.numbers in the matrix.
−
−
502
126
rows
columns
This order of this matrixThis order of this matrix
is a 2 x 3.is a 2 x 3.
8. In matrix algebra, a real number is often called aIn matrix algebra, a real number is often called a SCALARSCALAR..
To multiply a matrix by a scalar, you multiply each entry inTo multiply a matrix by a scalar, you multiply each entry in
the matrix by that scalar.the matrix by that scalar.
−
−
14
02
4
−
−
=
416
08
−
−
=
)1(4)4(4
)0(4)2(4