Find x^2+y^2 ifx+y=-14 and xy=84
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x² + y² = (x + y)² - 2xy
x² + y² = (-14)² - 2 . 84
x² + y² = 196 - 168
x² + y² = 28
x² + y² = (-14)² - 2 . 84
x² + y² = 196 - 168
x² + y² = 28
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