Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Simple absolute value problem?
I'm not really sure how to answer
|x+1| + |x-1| = 3
thing is, it's easy when you have one absolute value, but i get confused when I see two. I'd just like the answer and a brief process.
thanks!
3 Answers
- Ron WLv 71 decade agoFavorite Answer
Determine the value(s) of x at which each of the absolute values is zero, then use that to divide the real line into pieces. In this case, the zeros of the absolute values occur at x = -1 and x = 1. These divide the real line into three pieces: x < -1, -1 ≤ x ≤ 1, and x > 1
Consider each region separately.
x < -1: in this region, |x+1| = -(x+1) and |x-1| = -(x-1). Put these into the equation:
-(x+1) + -(x-1) = 3
-x - 1 - x + 1 = 3
-2x = 3
x = -3/2
-1 ≤ x ≤ 1: in this region, |x+1| = x+1 and |x-1| = -(x-1). Put these into the equation:
x+1 + -(x-1) = 3
x + 1 - x + 1 = 3
2 = 3
Therefore, there is no solution in this region.
x > 1: in this region, |x+1| = x+1 and |x-1| = x-1. Put these into the equation:
x + 1 + x - 1 = 3
2x = 3
x = 3/2
- courtoyLv 44 years ago
a. because of the fact the answer to a minimum of something taken out of absolute fee could be postive, there is no answer to this subject b. 2|x| = 2 (Divide the two components by skill of two) |x| = a million x= -a million and x=a million (the two solutions could be x becase the abs(-a million) = a million and abs(a million)=a million c. 2|x| - 4 = 0 (upload 4 to the two components) 2|x| = 4 (Divide by skill of two on the two components) |x| = 2 x = 2 and x = -2