| Algebra 1 Notes
Chapter Two
Section 2.1
Section 2.2
Section 2.3
Section 2.4
Section 2.5
Section 2.6
Section 2.7
Section 2.8
Section 2.9
Section 2.10
|
|
Back to Mrs. Leary's math Web Page or
Back to Algebra Contents
Section
2.8: Inverse of a Sum and Simplifying
|
The Property of - 1 |
| For any rational number a,
-1(a) = - a
(Negative one times "a"
is the additive inverse of a.) |
|
The Inverse of a Sum Property |
| For any rational numbers a and b,
-(a + b) = - a + (-b) |
Remember:
-
The sum of two negative
numbers is negative.
-
The product of two negative
numbers is positive.
-
Write out each step.
-
Accuracy is important.
-
It only takes one incorrect sign to
obtain an incorrect answer.
-
Parentheses ( ) and brackets [ ] and
{ } are called grouping symbols.
A fraction bar is also a grouping symbol. Perform
operations within the numerator and the denominator before
simplifying further.
-
A number directly preceding a
variable indicates multiplication, and when the variable is replaced
with a number you must indicate the multiplication in some other
way. This is usually best accomplished with
parentheses. For example:
| Evaluate -2x -
5 for x = 6
-2(6) - 5
-12 - 5
-17
|
Take class notes.
Before starting your homework, rework the
examples that are illustrated in this section of your textbook and the
examples that I demonstrated in class.
Then do your homework.
Write down questions (examples or concept
that you do not understand).......then.............. Ask these questions
in class.
|