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+---- Thread: College Algebra, What is this? (/Thread-College-Algebra-What-is-this)
College Algebra, What is this? - CLEP101 - 10-22-2008
How is this one done?
If 5 + m = n, what is the value of 2|m â n|?
a. −10
b. −5
c. 5
d. 10
e. It cannot be determined from the given information.
College Algebra, What is this? - gcalvin - 10-22-2008
5 + m = n
2|m - n| =
2|m - (5 + m)| =
2|m - 5 - m| =
2| -5 | =
2 * 5 = 10
Answer (d) is correct.
-Gary-
College Algebra, What is this? - CLEP101 - 10-23-2008
gcalvin Wrote:5 + m = n
2|m - n| =
2|m - (5 + m)| =
2|m - 5 - m| =
2| -5 | =
2 * 5 = 10
Answer (d) is correct.
-Gary-
So in this case, the m cancels out because you combine the like terms which one is negative and one a positive. I'm assuming that the two lines outside the -5 are asking for the absolute value of the -5 which would be positive 5 and multiplied by 2?
I just want to make sure I got it.
Thanks Gary
College Algebra, What is this? - gcalvin - 10-23-2008
That's right. I don't much like "cancels out" as it seems vague and sloppy and ultimately not helpful. It's really just that m - m = 0. A lot of people use "cancels out" for something like m/m = 1 also, but I think it's better to think clearly and explicitly about both those cases. You're absolutely right about absolute value: | -5 | = 5.
-Gary-
College Algebra, What is this? - nj593 - 08-24-2009
I didnt look at it in depth but would imagine 10 because it says 5 is m which is n times that and you get 10 atleast in my warped math head:p
clep101 Wrote:How is this one done?
If 5 + m = n, what is the value of 2|m â n|?
a. −10
b. −5
c. 5
d. 10
e. It cannot be determined from the given information.