Kathleen's Scribepost for February 16, 2011

Multiplying Binomials by Monomials

Today, we started out with an equation to solve.

- ( x + 7 )

How to solve:

= -1 ( x + 7 )

= -1x + (-1)(7)

= -x -7

Next equation:

2(3x + 4)

Solve:

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

= 6x + 8

This is called distributive property.

The trick to answering an equation is to look at the signs very carefully.

Signs will always confuse you.

(-)(-) Two negatives makes a positive.

(-)(+) One negative makes a negative.

(+)(+) Positives makes a positive.

Example:

-2 ( 3x - 4 )

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

= -6x - 8

2x ( 3x + 4 )

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

= 6x ² + 8x

Another way to write this is:

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

Which equals the same thing.

Now a model can be shown:

Another equation is:

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

= -4x(2x) + (-4x)(-3y) + (-4x)(5)

= (-4)(2)(x)(x) + (-4)(-3)(x)(y) + (-4)(5)(x)

= -8x ²+ 12xy -20x

Now one more step is missing; which is the equation has to be in alphabetical order for final answer.

= -8x ²- 20x + 20xy

Homework:

Read pages 264-268

CYU 2 & 3

Practice Odd or Even

2 Apply

Extend - 19 & 20 or 20 & 21

Homework Book 7.2

Extra Practice 7.2

Kathleen's Scribepost for December 10, 2010

Today in math : Classifying Triangles

HOMEWORK 

4.3 Extra Practice 
Textbook ; Practice and Apply ODD OR EVEN, Extend 18 and 20. 
Oh, sorry for all the pictures and not much words. Just got lazy with paint. SORRY! 

AND I PICK PAULO FOR THE NEXT SCRIBER. HAVE FUN. 

Kathleen's Scribepost for November 4, 2010

2.2

Question #12

A pelican dives vertically from a height of 3.8 m above the water. It then catches a fish 2.3 m underwater.

a) Write an expression using rational numbers to represent the length of the pelican's dive.

b) How long is the pelican's dive?

a) Answer will be a rational number or integer cause the question asked to write an expression using rational number.

3.8 - (-2.3)

3.8 is positive because it's above water and -2.3 is negative because the pelican went underwater.....like descending.

The answer is a positive because the subtrahend is much bigger than the minuend.

b) The pelican's dive is about 6.1 meters long.

Kathleen's Scribepost for October 15th

Today, in math class, we learned about integer number lines and number lines.

We had to label the number lines with the numbers Backe would tell us.

First thing we had to label on the number line is going by 2.

NUMBER LINE:

INTEGER NUMBER LINE:

The next thing we did was number the number line, going by half.

NUMBER LINE:

I think that was it. If I forgot to put something or made a mistake, just comment.

IT'S HOMMMEEEWOOORRRKK TIME :)

• Chapter 2 Warm-Up ( green sheet )
• Get Ready on homework book.
• Read the beginning of 2.1 on the textbook.
• DO ALL SYK on the text book. 2.1 :) ( there's only 3 )

I pick...........................................................KISHA OSBORNE to do the next scribepost. HAVE FUN >:)

Do your homework every single day. :) K bye!