Smart people come in

The original poster: boxing champion Views: 145 Replies: 6 Posted in: 2013-06-12 18:55:32
Teach me how to solve this problem: If X squared + Y squared = 3, XY = 1, then what is X - Y? Need the process! Because I can't type that little 2, I used a square instead ^_^
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Uh, no
Can't understand
I can do all the math problems worth 30 points.
This is actually middle school-level for us... ∵ (x-y)² = x² y² - 2xy = 3-2 = 1, ∴ x-y = ±1
The perfect square formula in middle school
You learned this in elementary school? Wow! I'm a high school student, and the answer is plus or minus 1.
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