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Sticky Note
x² - xy + y² when x = -2, y = 2 value of expression is _____?
  1. 13
  2. -12
  3. 12
  4. None of these
Explanation

x² - xy + y²

= (-2)² - (-2)(2) + (2)²

= 4 + 4 + 4

= 12

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