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secondary 2 | Maths
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What is xy, I don't know :)
Date Posted: 4 years ago
Views: 199
|x - y||y - x| - (x + y)² = 28
Since |x - y| = |-(y - x)| = |-1||y - x| = |y - x|,
|y - x||y - x| - (x + y)² = 28
(y - x)² - (x + y)² = 28
y² - 2xy + x² - (x² + 2xy + y²) = 28
-4xy = 28
xy = 28/-4 = -7
Since |x - y| = |-(y - x)| = |-1||y - x| = |y - x|,
|y - x||y - x| - (x + y)² = 28
(y - x)² - (x + y)² = 28
y² - 2xy + x² - (x² + 2xy + y²) = 28
-4xy = 28
xy = 28/-4 = -7
See 1 Answer
Just Expand it
(Y-x)^2 - (x+y)^2 = 2x . 2y = 28 => xy = 7
(Y-x)^2 - (x+y)^2 = 2x . 2y = 28 => xy = 7
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