Mathematics · Algebra
Simplify the expression: x2 + y2 + (x - y)2 + (x + y)2 - 20
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 13x2 + 3y2 + 20
- 23x2 - 3y2 + 20
- 33x2 - 3y2 - 20
- 43x2 + 3y2 - 20✓
Correct answer
3x2 + 3y2 - 20
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