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Saturday, February 11, 2006

Scribe Time!

Well I just want to start this off by saying sorry guys for the late scribe.

Anyways lets get right into it,
We started off the class with Mr. K giving us 4 questions (questions that we should all know how to do by now), where we had to solve for x:


Answers are as follow:
1. x= 1/3 2. x= 0, 1 3. x= -6, 1 4. x= 1/2, -1

But of course there was a catch to these easy questions, which led to the next lesson.
Mr. K then gave us 3 more questions:

1. 3cosx + 1 = 2
2. sin^2x - sinx= 0
3. tan^2x + 5tanx= 6

Okay, now we're all thinking what the heck is this, but it is actually easier than it looks. We solve this like how we've been always solving equations. Except once we get to the last line, where we're trying to solve for x, we use our 2nd function on our calculator and the function sin or cos or tan, to get the actual value of x. In other cases, we dont even need to use our calculator to find the value of x. Confused?!? Okay let's take a closer look at it.

Heres a case where we dont have to use a calculator to find the value of x:


Heres another easier way of solving these types of problems:


After looking at those questions, we did 2 quizzes to help us learn the unit circle more. Then after lunch, Mr. K gave us more questions just like the previous ones. For people who weren't in class, here they are for practice sake.

1. Cos2x + 3cosx + 2 = 0
2. 4 sin^2x - 1 = 0
3. 3tan^2x - tanx + 4 = 0

Answers are:
1. x= no solution x= 180 degrees
2. x= 7 pi/ 6 , 11 pi / 6 x= pi / 6, 5 pi/ 6
3. No solution

Then we went over some homework questions people had troubled on, then Mr. K gaves us 2 worksheets that we had to solve in a group, and hand in for marks.

Oh yeah for people who weren't in class we took down some notes also.


Okay well thats pretty much all I can remember guys, sorry it couldn't be anymore longer and again sorry for the wait.

The next sribe for monday is Emile.



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3 Comments:

At 2/12/2006 8:58 AM, Blogger Ms. Armstrong said...

Hello all,
I thought I might be able to help out with the ever annoying exponent problem. Instead of typing sin^2x, you can use a little html code to create the exponent. To do this, just type sin2x and then click on the html tab at the top right of the composing box. Type the code <sup> before the exponent and the code </sup> after the exponent.This will raise it up.
I have to give credit to Danny T. (grade 9 student) who showed me how to do this. That's the beauty of blogging - everyone is teaching everyone :) If you have a few spare moments, why not pop by the S1 site and leave some encouraging feedback for them. They would love to hear from you.
s1math.blogspot.com

 
At 2/12/2006 11:22 PM, Blogger Mr. Kuropatwa said...

Jacky, this scribe post is absolutely breathtaking!!

You've set an extremely high standard for the scribes who follow you. Really, I don't think I've ever seen a scribe post so well done.

The graphics are spectacular. I particularly liked the annotations you included in the boxes. You really are a textbook author. Bravo!!

 
At 3/01/2006 5:34 PM, Blogger Regine said...

This is probably a late comment, but holy heck. This is scribe really awesome. it's so articulate and well elaborated. Man, you're good...

 

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