If, (a-b) = 4 and a x b = 2, then (a2+b2) = ?
(a) 20
(b) 18
(c) 25
(d) None
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Answer / kk
a-b = 4 or (a-b)*(a-b)= 16,
Now,Given a*b=2,then
a2-2ab+b2=16 or a2-4+b2=16 or a2+b2=16+4=20
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