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If x + y = 12 and xy = 14 find x2 + y2. |
Answer» (x + y)2 = x2 + y2 + 2xy 122 = x2 + y2 + 2 × 14 144 = x2 + y2 + 28 x2 + y2 = 144 – 28 x2 + y2 = 116 |
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