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hw#8-3: Due
Tues Apr 10 (B)
Weds Apr 11 (A)
pg 501-502 #9-43 EVERY OTHER ODD (ff course, you can do all of the ODDS for extra practice)
hw#8-4: Due
Tues Apr 10 (B)
Weds Apr 11 (A)
pg 507-508 #9-16 All, 17, 25-30 Odd, 37-43 Odd, 49
USE BOTH FOIL AND the AREA MODEL
(the book discusses the "distribution" and a table method, both are very similar to what we have done in class, so just use any method you are comfortable with)
UNIT 8 QUIZ + UNIT 6&7 BOOSTER OPPORTUNITY:
Thursday, April 12th (B)
Friday, April 14th (A)
Can u give us a problem with both squaring and foil. It would help to see them together
ReplyDeleteI plan to make a couple of videos tomorrow... I'll try to address your question... if you could be a little more specific with your question that would help me help you.
Deletepage 502 #29)
ReplyDeleteI'll assume that some of you had difficulty with this problem in advance of your questions (yes, I'm psychic!... oh, and the other class asked!).
The problem shows a cylinder with a radius of (x+2) and a height of (x+5) and asks you write an expression for the surface area in standard polynomial form. What an exciting Easter puzzle!!
Well, as with anything, let's "chunk it" and see what happens.
The total SURFACE AREA (SA) is equal to the area of the top and the base (both circles) and the area of the cylinder wall (when you unroll it you gotsk a rectangle, yes?).
So, the area of one circle is πr^2 or π(X+2)^2
The area of two circles (top & base) = 2[π(x+2)^2]
When you roll out the rectangle, it turns out that the length of the rectangle is equivalent to the circumference of the circle (C=2πr), yes?
So the area of the cylinder wall (A=lw) is (x+5)[2π(x+2)]
So, the SA = Area of the circles plus the Area of the Cylinder Wall
SA = 2[π(x+2)^2] + (x+5)[2π(x+2)]
Your job (should you choose to accept it) is to SIMPLIFY the expression and write it as a polynomial in standard form.
NEW MAJOR HINT: It is MATHEMATICAL CONVENTION in a case such as this to leave π as π, as opposed to using 3.14 and multiplying through (get used to it, just ask your brother!!). In other words, you will treat π like a coefficient, i.e. 4πx^2 or 2πx, etc.
Capeesh??
#17 on page 507 is giving me lots of trouble. help!
ReplyDeleteThink about it... #17 is simply asking you to subtract the white region from the total large square area... be careful, you will have to subtract the ENTIRE SCHMEGGEGY, which means you will have to DISTRIBUTE THE NEGATIVE (da da dummm):
Delete(x+4)^2 - (x-1)^2
x^2 + 8x + 16 - (x^2 - 2x + 1)
x^2 + 8x + 16 - x^2 + 2x - 1)
10x + 15
OR "(10x + 15) units squared" to be precise
On the upcoming test/quiz, are we allowed to use color?
ReplyDeleteABSOLUTELY!!! Colored pencils and/or highlighters can be used on ALL of my tests and quizzes... there is a rumor that you might be able to use color on standardized tests like the ASK sometime soon, but that's just a rumor for now.
Deletenevermind i got up the videos and i didnt know u had a grandfather clock i could hear it riging in ur video.
ReplyDelete... it's a nice match with the cuckoo clock(s) I have in class!
Delete