Subject
MBA Exam
Topic
Evening MBA-DU(21th Batch)
If x + y = a and x-y = b then 2xy = ?
If x + y = a and x-y = b then 2xy = ?
ক)
(b2-a2)/2খ)
(a2-b2)/2গ)
(a-b)/2ঘ)
(ab)/2Explanation
here, x+y=a x-y=b so, x=a+b/2 so,y=b-a/2 2xy=2 X (b+a)/2 X (b-a)/2=b2-a2 /2Related questions
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