### Scribe Post for January 7, 2010

Thursday, January 7, 2010
Hello 9-05 ! So today we started Chapter 3.2: Exponent Laws. Mr. Backe helped us with some stuff we didn't understand in our homework yesterday:
• Read page 99 to 104
• Answer Explore Operations on powers, Reflect and Check, Check Your Understanding- page 105, and all Show You Knows-page 101, 102, 103 and 104.

In class, we wrote notes in our foldables.

We wrote notes in the middle where it says Exponent Laws and Key Words.

FIRST FLAP:

The Product Law:
When multiplying powers of the same base, simply add the exponents to find the product
example:

We also had to put not examples, exponents with different bases:

SECOND FLAP:

The Quotient Law:
When dividing powers of the same base, simply subtract the exponent to find the quotient.
example:

We also had to put not examples, exponents with different bases:

THIRD FLAP:

The Power of a Power Law:
When raising a power by a power, simply multiply the exponents to find the new power.
example:

WHY? it's because this question means to multiply 5 x 5 3 more times.

FOURTH FLAP:

Power of a Product Law:
When a product is raised to an exponent, you can rewrite each number in the product with the same exponent.
example:

FIFTH FLAP:

Power of the Quotient Law:
When a quotient is raised to an exponent, you can rewrite each number in the quotient with the same exponent.
example:

SIXTH FLAP:

The Zero Exponent Law:
When the exponent of a power is 0. The value of the power is 1 if the base is not equal to 0.
example:

WHY? It is 1 and a positive even though the base is a negative because it fits the pattern. Watch...

See what's happening? This reminds me of the rule about multiplying and dividing integers:

*When multiplying or dividing variables, if there's an even amount of positive or negative numbers the answer will be a positive.

*When multiplying or dividing variables, if there's an odd amount of positive or negative numbers the answer will be a negative.

Homework:
• Practise, Apply and Extend - Odd or Even numbers.
• 3.2 Extra Practice
• 3.2 Workbook
• Fill in definitions and examples for 3 point approach and foldable so you're caught up with everything
• Self Assessment for 3.1 and 3.2 since we're done both
• JOURNAL
• also try to figure out definition of Exponent Law of 1, Negative Exponent Law, Base of 1 Law if you have time (:

Extra Info you guys may need in case it pops up in the homework:
Negative Exponents: I think it's the same as Negative Exponent Law..I'm not sure.

If a positive exponent means how many times you multiply the base by itself, a negative exponent means how many times you divide the base by itself.

Please comment and tell me what you think, point out my errors and things I could improve on (:

melanie905 said...

Great scribe Karen! Very understandable and you mentioned everything (; I liked how you used some colour, italics, and your pictures. Also, about the negative exponents... I agree with the dividing part. It makes a lot of sense. But, not 100% sure so we'll just have to ask Mr.B sometime (; Maybe tomorrow! Well overall, GREAT WORK! Thanks for the homework reminders (;

angela905 said...

Great scribe Karen! The one with the exponent of zero (with the negative base ) really helped me. Because when I type that in my calculator (with no brackets) it gives me negative one. But, the law in the book says that the value of the power is always positive one, as long as the base is not zero. We also had a question like that; in apply or something. Then I checked at the back of the book, and it says it's -1.So I was kind of debating on that.

Karen9-05 said...

I kind of didn't understand that one too. But I asked Mr. Backe and his explanation is made it better. if it's -10 raised by zero the answer is 1 because it fits the pattern, i am still confused about what pattern and why it is 1 but i know that it is a negative cus of the whole even and odd amount of negatives. i hope this really helped you guys (: i tried to explain it as much as possible and so it makes sense.

Karen9-05 said...

sorry if i keep on changing the chart, i just kept on getting it wrong -__- fixed now. i hope.

xtian 9-05 said...

Good job Karen, its very understandable, you explained each exponent laws very well. Sorry if my comment was late...

Zerlina905 said...

Great job Karen! I like your pictures and you explained the Exponent Laws very clearly! I really like all of the colours. Great job again!

Mr. B. said...

I think you need to put the -1 into brackets. Otherwise all answers will be -1.

Karen9-05 said...

fixed it and thanks guys (:

shaneille 9-05 said...

Great job Karen! I liked how you made the flap titles big so everyone knew where to write the definitons. Great use of colour too. Great job again.

kara 9-05 said...

Woah! Great job Karen! You used a lot of detail when explaining what goes into each flap. Good work!