Krissia's Journal Entry

March 3, 2010

Today in math class, we learned about multiplying and diving polynomials. Here is an example that we worked on today.

Basically, it's like 2 and 3 are multiplying and x and x are multiplying.

PICTURE MODEL

The first factor is always on the left. **Exponent law for the multiplying

The second factor is always on the right. exponents is you ADD them**

We also started dividing Polynomials

**The thing that will mess you up MOST is remembering the variable and its exponent*

REMEMBER: The exponent law for diving is you subtract the exponents.

Positive divided by a negative = negative

Francis M journal entry

February 22 and 23

Shaneille's Journal Post

March 3 2010

Today we started chapter 7.

First thing,

(Negative)(negative) = Positive

(positive) (positive) = Positive

(positive)(negative)= Negative

Learning to multiply.

(2x)(3x)
which means (2)(3)(x)(x)

(2)(3) =6
(x)(x) = x^2
So (2x)(3x)=
=6x^2

Then dividing.

6x/-3x = -2x

Christian's Journal Entry

April 5, 2010

Today in math, we analyzed the difference between Extrapolation and Interpolation, we also differentiate, Linear Relation and Linear Equation...


INTERPOLATION: Estimating a value between the given value.



EXTRAPOLATION: Estimating a value beyond the given value.

Linear equation is finding the equation on the x and y axis, showing a straight line when graphed.

Example.



Linear relation is relation that appears as a straight line whe

Kristin's Journal Entry

February 26, 2010

Today in class we learned about a negative in front of a bracket and adding and subtracting polynomials.

eg. 55x + 30 - (22x + 20) you can't leave it this way so it becomes: 55x +30 -22x - 20

A negative in front of a bracket means: the opposite of everything in the bracket.

Why? -( means -1 multiplying everything inside the bracket

Adding polynomials

- use models

(3x -4) + (2x +5) = 5x + 1- use symbols

(3x + 4) + (2x + 5)

=3x + 2x - 4 + 5

= 5x + 1

Subtracting polynomials

-use models

- add the opposite
(3x - 4) - (2x + 3)
= (3x - 4) + (-2x - 3)
= 3x - 2x -4 - 3
= x - 7

Joseph's Journal Entry

Jounel Entry Post

March, 3. 2010

Today in math class we reviewed some homework from yesterday. Next we started on a new unit on multiplying and dividing polynomials.

The first thing that we talked about is how to use algebra tiles to find out the answer to an equation. eg. (2x)(3x). To do this question using algebra tiles, you will first need to know that.....

Now that you know this, lay out your tiles as so.

Your first number in a multiplication equation will always be on the the left part of the diagram. Now just fill in the middle part of your diagram with as many x squared tiles as needed. In this case you have to add 6 x squared tiles.

The tiles in the middle of your diagram is your answer which is 6x squared.

After that we learned how to solve the same equation but algebraically this time. To solve this algebraically you just have to simply multiply both coefficients as well as the variables together to get your answer.

Next we learned how to solve division questions with algebra tiles. For this example we will use this simple question. 6x^2/3x. To solve this question lay out our tiles like this...

Notice that 3x is placed on the top of the diagram instead of the left.

The next step is very simple. Just draw as many tiles as you need so that you can multiply 3x by a certain number to get the the middle amount of tiles which is 6x^2. For this question the missing number is 2x.

To solve this question algebraically you have to divide the coefficients, and variables together. Remember that any variable without a degree will always have a degree of one. Also remember that when dividing the variables together you can subtract the exponents from both of the variables to get your answer.