If a+b =12 , ab =22, then (a2 + b2) is equal to:
 a) 188
 b) 144
 c) 64
 d) 100
SSC CHSL-2014

100.

Solution
Squaring a+b;
(a+b)2 = a2+ b2 + 2ab
144 = a2+ b2 + 44

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