3, -3
2, -2
1, -1
3, -1
Correct answer is A
a2 + b2 = 16 and 2ab = 7 To find all possible values = (a - b)2 + b2 - 2ab Substituting the given values = (a - b)2 = 16 - 7 = 9 (a - b) = ±9 = ±3 OR a - b = 3, -3
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