## Algebra

Showing posts with label multiply. Show all posts
Showing posts with label multiply. Show all posts

### Multiplying and Dividing Integers

YouTube Playlist on Real Number Operations

Multiplying a negative number by a positive number will result in a negative number. And when multiplying two negative numbers the result will be positive. Be careful when simplifying 5(−6), the operation here is multiplication NOT subtraction so 5(−6) = −30. The rules for division are the same.

(Negative) x (Positive) = (Negative)
Example: (−7)(+4) = −28

(Negative) x (Negative) = (Positive)
Example: (−7)(−4) = +28

Also, zero times anything is zero.

Multiply or Divide.
Dividing by zero is undefined. What happens when you try to divide by zero on a calculator?

Zero and Division

Divide.

### Elementary Algebra Exam #4

Click on the 10 question exam covering topics in chapter 7 (Rational Expressions and Equations). Give yourself one hour to try all of the problems and then come back and check your answers.

Simplify (Assume all denominators are nonzero.)
Perform the operations and state the restrictions.

Solve.

10. The sum of the reciprocals of two consecutive odd integers is 4/3.  Set up an algebraic equation and use it to find the two integers.
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### Elementary Algebra Exam #3

Click on the 10 question exam covering topics in chapters 5 and 6. Give yourself one hour to try all of the problems and then come back and check your answers.

10. The length of a rectangle is 4 centimeters less than twice its width. The area is 96 square centimeters. Find the length and width. (Set up an algebraic equation then solve it)

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