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
Promoted
If 2x+2y=100 and xy=18 find the value of x-y?
solve and explain
Update:
answer is +/- 8
Update 2:
i didnt write this problem but something seems awry to me...
1 Answer
Relevance
- LearnerLv 79 years agoFavorite Answer
i) 2x + 2y = 100; dividing by 2, x + y = 50 and xy = 18 (given)
ii) By algebraic identity, (a - b)² = (a + b)² - 4ab
==> (x - y)² = 50² - 4*18 = 2500 - 72 = 2428
iii) Taking square root of the above, |x - y| = 49.27 (nearly)
Still have questions? Get your answers by asking now.