If a2 + b2 = 25 and ab = 12, then    is
 a) 4
 b) 5
 c) 6
 d) 7
KPSC Divisional Accountant-15

7.
Solution
(a+b)2 = a2 + b2 + 2ab
=> a+b = 7
(a-b)2 = a2 + b2 - 2ab
=> a-b = 1

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