If (x+y)=8 and (x-y) =6 ,whatt is the value of xy?
Solution
Correct Answer: Option A
দেওয়া আছে ,x+y=8
এবং ,x-y=6
∴ xy={(x+y)/2}² -{(x-y)/2}²
=(8/2)²-(6-2)²
=4²-3²
=16-9
=7
এবং ,x-y=6
∴ xy={(x+y)/2}² -{(x-y)/2}²
=(8/2)²-(6-2)²
=4²-3²
=16-9
=7
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