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