Scribe Post for March 8, 2010

Today for math we finally got our tests back! The first bit of class was actually finding the mistakes that we did and fixed them. The second half of class was literally learning new stuff, the most special thing that we learned in class was a procedure called "FOIL". Which actually stands for First, Outside, Inside, Last.

Some of the questions that we did for practice was the following:

1.(3a+3)(-3a+4)

F - (3a)(3a)= 9a^2
O - (3a)(-3)= -9a
I - (3)(3a) = 9a
L - (3)(-3) = -9

-9a^2+12a-9a+12 = 9a^2-9


2.(6a-2)(6a+3)

F - (6a)(6a)= 36a^2
O - (6a)(3)= 18a
I - (-2)(6a)= -12a
L - (-2)(3)= -6

36a^2+18a-12a-6= 36a^2+6a-6

3.(-4a+3)(-3a+4)

F - (-4a)(-3a) = 12a^2
O - (-4a)(4) = -16a
I - (3)(-3a) = -9a
L - (3)(4) = 12

12a^2-16a-9a+12 = 12^2-25a+12

That's about how much we learned today, I know it's not incredibly a lot or hard at all. Remember that "FOIL" only works when 2 binomials are being combined(multiplied)..

I don't think there's any homework that I know of, please tell me if I'm wrong.

For the next scribe the bunny picks...

Scribepost

March 5,2010

Okay, on Friday, we didn't learn exactly anything new but we did went over a question. We also got a TON of blue papers for chapter 7. There is really nothing new to say exept for the homeworks...

The main homework that should be done BY Monday is the stash it..which is the...
Foldable
Self assessment
Challenges (one of the two..which are kayaks for rent or what have you got to hide)
The mathlinks
Signed test

Then the homework that should be "considered homework" is...
Daffynition Decoder
7-3 and 7-4(green booklet)
7.1 extra practise and work book
7.2 extra practise and work book

Well that's all that I got to say... for my scribe...

the next scribe is...
MARC!

please comment....

Scribe Post for March 4, 2010

Today we had a double math class. In the morning we did our test, then in the afternoon we learned more about our new unit.

Multiplying monomials by polynomials:

(3x) (x + 5)

model:

• this model says that the answer would be 3x^2 +15, because the large squares represent x^2 and the skinny rectangles represent x. So if you multiply to x's together they become x^2. When you multiply an x and a constant (5), the answer results in x.

Algebraic:

(3x) (x +5)

(3x) (x) + (3x) (5)

= 3x^2 + 15x

• In the algebraic way you use distributed property, which means to multiply a single term and two or more terms inside a set of parentheses (brackets)

The second example we did in class:

(2x-3) (2x)

model:

• The answer shown in the picture would be: 4x^2 + -6x

Algebraic:

(2x-3) (2x)

(2x) (2x) + (2x) (-3)

=4x^2 -6x

Then we got some other questions to solve, but we did not have to make a model for it.

1) (2y-1) (7y)

(2y) (7y)+(-1) (7y)

= 14y^2 - 7y

2) (y+2) (-6y)

(-6y) (y) + (-6) (2)

= -6y^2 - 12y

Homework:
read pg 264-268 ( key ideas)

check your understanding # 2, 3

practise # 4 or 5
6 or 7
8 or 9
12-21

Due on monday ( stash it stuff)

Kayaks for Rent or What Have You Got to Hide (Challenges)

Foldable

Self-Assessment

Math Links (Sheets)

Signed Test

That's my scribe! For the next scribe I choose Kim.

Scribe for March 3, 2010

Hello 905! Today we started class by reviewing two questions from the homework.

Question #14 from the Chapter 5 Practice test.

A) 4n+7+5n+6= 9n + 6
B) This could represent the difference between each squirrel.
C) (5n-1)-(4n+7) = 5n-1-4n-7
= n-8

* remember that when the negative is outside the brackets whatever inside is the negative*
Next Question #15 from the Chapter 5 practice test.

A) $100+5b b=bowling shoes
B) $20+4b b=pizza
C) 100 + 5b + 20 +4b = 120+9b

D) 120+9(9) =120 +81

= $201

~CHAPTER 7 ~
Multiplying and Dividing polynomials.
one thing to know about negative and positive numbers.

(-)(-)= +

(+)(+) = +

(-)(+) = -
(+)(-) = -
(-)/(-) = +
(-)/(+) = -
(+)/(+)= +

(2x)(3x)

so (2x)(3x)= 6x(squared)

* reminder (-2x)(4x) the first set is on the side so -2x would be on the side, the second set is always on the top 4x would be on top*

Another example using algebra this time .

Dividing

~Homework time ~ Due Friday!

Read pg 254-258

Key ideas pg 259

Cyu #2

Apply

3 or 4 ,5 or 6 , 7 or 8, 9,10, 11 or 12, half of 15 and 16, 17-24, 26+27

journal.

math links,

Foldable.

I just touched on a bit we did on class, sorry if i missed something, comment please.

The next scribe is Simran.

Scribe for March 2 2010

The first thing we did in class was go over some textbook questions. The first one was #28a.

Not sure if you could read that so here's the text version...

A small manufacturer makes air quality monitoring kits for home use. The revenue, in dollars, from the sale of n kits can be shown by -n^2 + 3600n. The cost, in dollars, to make n kits is represented by -3n^2 + 8600. The manufacturer makes a profit if the cost subtracted from the revenue is positive.

a) Write an expression to find the profit. Simplify your answer.

So basically here, you just have to subtract the cost to make the kits from the revenue (which I found out, actually means the company's income).

Then you simplify it.

After this, Mr. Backe talked about the rules of writing polynomials that have at least three terms.

The first thing to follow is that the terms are alphabetically ordered.

The second thing to follow is to order the like terms in an ascending or descending order. Usually, it's descending and the only time they ascend is if the terms are similar. eg. 3, 3x and 3x^2

So using these rules, we rearranged x^2y + x^3 + y^2. The math stuff is going to be really hard to read without the pictures so... yeah, if you can't read it, then sorry.

Then we rearranged a^3 + a^4b + a^5b^3c^2 +b^2c + a^4.

After that, we talked about #29.

29. Simplify (2x + 4x + 6x + 8x + ... + 2006x + 2008x) - (x + 3x + 5x +7 x + ... + 2005x + 2007x).

Here, the '...' means that it goes on until the next part.

So it's kind of troublesome to actually do all that so we did the smaller parts first.

2x + 4x - (x + 3x) = 2x.
2x + 4x + 6x - (x + 3x + 5x) = 3x.
2x + 4x + 6x + 8x - (x + 3x + 5x + 7x) = 4x.

Here, we looked for patterns and we found that the last term of the first phrase divided by two equals the answer.

2x + 4x - (x + 3x) = 2x.
2x + 4x + 6x - (x + 3x + 5x) = 3x.
2x + 4x + 6x + 8x - (x + 3x + 5x + 7x) = 4x.

Then the rest of the class was a work period for the stuff we have to work on (review, ch test etc.)

Next scribe is Shaneille.

Scribe Post for March 1, 2010

Hello 905! To day in class we went over one of our questions from our homework. Number 17.

You have to add the bottom two rectangles to get the top rectangle. Like this:

So you add each and put the simplified version on top.

(2x- 1)+(x-2)=3x+2

You combine like terms. I won't show my work because I think everybody knows how to combine like terms already. By the way if you don't know the definition of like terms here it is, Terms that only differ by their coefficient. So Terms that have the same variable and exponent.

(x+3)+(3x-2)=4x+1

(3x-2)+(x+2)=4x

Then you use these expressions to find the next rectangle on the pyramid.

(3x+2)+(4x+1)=7x+3

(4x+1)+(4x)=8x+1

And you do it one more time to find the top of the pyramid.

(7x+3)+(8x+1)=15x+4

And then your pyramid should look like this:

Now if you know how to do this you'll be able to do question 19. I'm just going to review how to subtract with algebra tiles so I don't need to go over #19.

eg. (6x+2)-(-9x+3)

You can add the opposite. So you change the minus to plus and make the numbers in the second bracket the opposite.

(6x+2)+(9x-3)

=6x+9x+2-3

=15x-1

Now here's how you do it with algebra tiles.

After that we worked on Extend, Review or the Chapter Test.

If you didn't finish it's homework

Homework:

Extend

Review of Chapter test

Journal (As always)

Stuff due on Friday: (Stash-its)

Kayaks for Rent or What Have You Got to Hide (Challenges)

Foldable

Self-Assessment

Math Links (Sheets)

Signed Test

BTW the test is on Wednesday. And for next scribe I choose Aleiah!

Please Leave a Comment and thanks for reading my scribe!

Scribe Post for February 26, 2010

Hello 9-05 (:
Though there were a lot of people away on friday, there was still math class, and homework of course. By the way, GOOD JOB TO ALL THE BAND PEOPLE (:
First of all, Mr.B had to set up that projector thingy that always takes some time, but yeah .. we helped (;
After he got it all set up, we went to get our textbooks.
We went over questions 1-4 on Pg. 190. (Explore Adding or Subtracting Polynomial Expressions)
Here they are:









Now, you may be wondering about Question #4 ...
But even if you're not, you still need to know why some people are. (including me, at first)
Mr.B got into a huge discussion over this specific question, and here's why:

55x + 30 - (22x + 20) is NOT the same as 55x + 30 - 22x + 20

And that goes back to BEDMAS.
Brackets are always first, but according to the second expression, there are none, so you solve in order from left to right.

As Mr.B said, "COMMON ERROR."

Also Mr.B taught us this:
hint-hint, PUT THIS IN YOUR NOTES.

In Question #4, where it says 55x + 30 - (22x + 20) or 55x + 30 - 22x - 20, do you understand how they are equal?



Do you know why one is positive/plus, and one is negative/minus?

Well if you don't know:

- (22x + 20)
^
that negative sign means, the opposite of everything in the brackets.
Therefore, - (22x + 20) = - 22x - 20.

If you remember, on friday morning Mr.B came into our classroom, and told me that theres going to be a lot of notes for the scribe.
So I thought, there were just a lot of minor notes, but actually, there was just one major one.
It was really confusing at first, but the more he explained, the more I understood.
Plus, everyone else's explanations (;

So that was basically all we did today. I hope you understood my work. If I have any mistakes, please comment and tell me. And if you have any other questions, feel free to ask me, or Mr.B, which ever you prefer.

And before I forget, Mr.B also assigned some homework:
Pg. 191-194 Read 5.3 Examples (Textbook)
Pg. 195 Read Key Ideas, Add to notes (Textbook)
Pg. 195 Check Your Understanding #1-3 (Textbook)
Pg. 196-198 ALL Practice and Apply (Textbook)
NO EXTEND

TEST: Either next Tuesday/Wednesday, so do your homework and STUDY (;

The next scribe will be....
ZERLINA (;

Thanks again for reading my scribe, do your homework, study, and leave a comment.
AND ASK QUESTIONS if you have any.

SMILE (: