11.1 Sequences and Series: Arithmetic, Geometric
Recall:
A sequence is a function whose domain is the
set of counting numbers.
Note: The domain may be ﬁnite or inﬁnite. The associated
sequence is called ﬁnite or inﬁnite.
Often. a formula can be found for
FINDING THE TNVERSE OF A 3 x 3 MATRIX
STEP 1, wipe out row 1 and col 1 and
nd the determinant of the mattix which is
left. Put your answer in the row
1 col 1 position of a new matrix.
STEP 2. wipe out row 1 and co! 2 and nd the determinant of the mat
9.7 PARAMETRIC EQUATIONS
x2 - y I- 9 lo the equation of a conic.
x - y - o LOOKS like the equation of a conic,
our ISN'Tll
36
r I 3 doesn't look like the equation of a conic
1 + Zoose but is l
is a system of equations which when graphed
produce a con
POLAR COORDINATES
NAMING POINTS ACCORDING TO THEIR DISTANCE FROM
A POLE (ORIGIN) AND THEIR POSITION ON A TERMINAL RAY
OF AN ANGLE IN STANDARD POSITION WITH THE INITIAL
RAY CALLED THE POLAR AXIS!
P(r.9)
I \ r
C e5, ,0 1 Aé,
POL POLAR AXIS
Given the i