Friday, December 21, 2007

Addition to Subtraction

To change addition to subtraction what you have to do is leave the starting number the same but change the sign of all numbers after that to the opposite sign. Also change the addition sign to subtraction because subtracting a negative is just the same as adding a positive so the sum will still remain the same.

Example : 4 + 5 = 8
4 - -5 = 8

Problem -6-50

-6-50

To solve this problem I subtracted -50 from -6.

When I subtracted these integers I go -56.

Combining Terms: Patricia Parker Number 5

6a - 5 - 4-2a + 7=8a -16

First you add 6a+ 2a= 8a

Then You add -5 + -4 + -7+-16

You add the same varables together and there numbers.

Like the 2a and the 8a are to be added because they have the same varaibles.

com property of multiplication

Math Blue Nhaskins#3

From: nhaskins, 48 seconds ago

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Thursday, December 20, 2007

Darnell's way of Multiplying fractions

When you multiply a fraction like 3/4 * 2/3 you would first multiply the numerator and then the denomenator so that the answer would be 6/12 and to make that a whole number all you have to do is divide six into twelve to get 2.
5 * 5/4

5/1 * 4/5

20/5=4

Robbie's Associative Property Blog

The only way to explain the Associative Property is to move the parenthesis from one pair of numbers to another ex. a+(b+c)=(a+b)+c

Zacs Problem Factorin undoing the distrubitve property

2x + 6

2(1x) + 2(3)

2(1x + 3)

Additive Identity

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Distributive Property

Distributive Property

x -(4x+5)

Distributive Property is an algebra property that is used to multiply a single term and two or more terms inside a set of parentheses. When I do distributive property I know to multiply the outside numbers by the inside numbers. That’s all you really need to know. As you read on I will give you same examples to give you an idea on how to do distributive property.

For Example:

This is not the right way to do this problem.

Step 1. 8(3+7)

Step 2. 8*3+7

Step 3. 24+7

Step 4. =31

This is the right way to do this problem.
Step 1. 8(3+7)

Step 2. 8*3=24

Step 3. 8*7=56

Step 4. 24+56

Step 5. =80

For the problem x-(4x+5) you would think you would have to multiply the (X) with the two numbers in the parentheses which is 4x+5. A lot of people make this common mistake. In fact x-(4x+5) you don’t multiply the numbers in the parentheses with (X) but, with the (-).
For Example: you can rewrite the problem like this.

Step 1. x+-1(4x+5)
* only use the -1 in the multiplication
Step 2. -1*4x=-4x

Step 3. -1*5= -5

Step 4. Rewrite as 1x+-4x-5

Step 5. You get -3x-5

Zero Product Property

1. (x+5) (x-2)= 0
~ANSWER~
x=-5 or x= 2
2. x^2+3x-10= 0

~ANSWER~
x= - 5 or x=2
3. (x+5)(x-4) =0
~ANSWER~
x= -5 or x= 4
HELP/ NOTES

Zero - Product Property

Definition of Zero - Product Property

Zero - Product Property states that if the product of two factors is zero, then at least one of the factors must be zero.