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Wednesday, October 13, 2010
hw #2-3 Sections 2-3 & 2-4
pg 64-65 #1-39 Multiples of 3 3,6,9,...
pg 68-69 #4-40 Multiples of 4 4,8,12,16...
We will be going over ALL homework for this unit on Friday, so BLOG me with questions or be ready to ask good questions on Friday!
(2 1/6) + x = -b (2 1/6) + x = -(1/3)... always use parens ask yourself... What's bothering x? 2 1/6 is being added... so, subtract 2 1/6 from both sides x = -(1/3) - 2 1/6... now find a common denominator
x = -(2/6) - 2 1/6
Can you take it from here? Do you see your mistake yet?
Mr Chamberlain i was taking the pearson unit 2 review test and I got one wrong the problem was simplify -6 to the fourth power I got 1,296 but the computer said that it was wrong and the answer is -1,296 who is right?
When you see a negative sign in front of a number or variable, you can treat it as a coefficient of -1. A coefficient is a multiplier.
So, -6^4 is really -1*6^4.
If you evaluate -1*6^4 you would perform the 6^4 first (yielding 1296) and then multiply by -1, yielding -1296. Fully "STRETCHED" it would look like this: (-1)(6)(6)(6)(6)
Contrast that problem with (-6)^4. Since the negative sign is within the parens, if you STRETCH the problem to the fullest, you would get: (-1*6)(-1*6)(-1*6)(-1*6) which equals (-6)(-6)(-6)(-6) which equals +1296
I can't get 32 on pg69
ReplyDeletei always get x=-3 but the check never works i am doing something wrong
OK, compare your steps with mine:
ReplyDeletewhen b=1/3
(2 1/6) + x = -b
(2 1/6) + x = -(1/3)... always use parens
ask yourself... What's bothering x?
2 1/6 is being added... so, subtract 2 1/6 from both sides
x = -(1/3) - 2 1/6... now find a common denominator
x = -(2/6) - 2 1/6
Can you take it from here? Do you see your mistake yet?
lmk... Mr. C.
Mr Chamberlain i was taking the pearson unit 2 review test and I got one wrong the problem was simplify -6 to the fourth power I got 1,296 but the computer said that it was wrong and the answer is -1,296 who is right?
ReplyDelete-paige
When you see a negative sign in front of a number or variable, you can treat it as a coefficient of -1. A coefficient is a multiplier.
ReplyDeleteSo, -6^4 is really -1*6^4.
If you evaluate -1*6^4 you would perform the 6^4 first (yielding 1296) and then multiply by -1, yielding -1296. Fully "STRETCHED" it would look like this:
(-1)(6)(6)(6)(6)
Contrast that problem with (-6)^4. Since the negative sign is within the parens, if you STRETCH the problem to the fullest, you would get:
(-1*6)(-1*6)(-1*6)(-1*6) which equals
(-6)(-6)(-6)(-6) which equals +1296
So the question is:
Does -6^4=(-6)^4
The answer is a resounding NO!