# These are the formulas you will be given on the... which relate to the topics I said to focus on...

```These are the formulas you will be given on the final exam. You should assume that all others
which relate to the topics I said to focus on will need to be memorized. Note that on the exam I will
not label which formulas are used for what. You need to know when and how to apply each one.
• nth term formulas:
Arithmetic: an = a1 + (n − 1)d and an = an−1 + d
Geometric: an = a1 rn−1 and an = an−1 r
• nth partial sum formulas:
Arithmetic: Sn =
Geometric: Sn =
n(a1 +an )
2
a1 (1−rn )
and
1−r
for an infinite sum S =
a1
1−r
Looking through your book, I notice that there are more concepts, rather than formulas, to memorize.
Formulas you will need to memorize are for
• the equation of a line
• the slope of a line
• the midpoint of a line
• the distance between two points
• the properties of logarithms
• the inverse of a 2 &times; 2 matrix
• cofactors for finding the determinant of a matrix.
The rest of the memorization will be to understand the concepts behind solving problems within the
topics listed in the final exam review sheet.
1
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