x²+y²=25 এবং xy=12 হলে x+y=?
Solution
Correct Answer: Option B
দেওয়া আছে,
x²+y²=25
এবং xy =12
অতএব,(x=y)²=x²+2xy+y²
=x²+y²+2xy
=25+2.12
=25+24
বা, (x+y)²=49 =72
∴ x+y=7
x²+y²=25
এবং xy =12
অতএব,(x=y)²=x²+2xy+y²
=x²+y²+2xy
=25+2.12
=25+24
বা, (x+y)²=49 =72
∴ x+y=7
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