1.

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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