x+y=2,x²+y²=4 হলে ,x³+y³ =?
Solution
Correct Answer: Option B
দেওয়া আছে ,x+y=2
এবং x²+y²=4
বা,(x+y)²-2xy =4
বা,(2)²-2xy=4
বা,-2xy=0
বা, xy =0
অতএব ,,x³+y³ =(x+y)³-3xy(x+y)
=(2)³-3.0.2
=8-0
=8
এবং x²+y²=4
বা,(x+y)²-2xy =4
বা,(2)²-2xy=4
বা,-2xy=0
বা, xy =0
অতএব ,,x³+y³ =(x+y)³-3xy(x+y)
=(2)³-3.0.2
=8-0
=8
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