Question
If (x + y) = 6 and (x2 + y2) = 20,
then the value of (x – y)2 is equal to:Solution
(x + y)2 = x2 + y2 + 2xy Or, 2xy = 62 – 20 = 16 Then, (x – y) = x + y – 2xy = 20 – 16 = 4
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