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Question
x-y=2 এবং xy=8 হলে , x+y= কত ?
±
10
±
6
±
4
ANSWER : 2
Descrption
<p>we know: <a href="https://www.sattacademy.com/job-solution/single-question?ques_id=56473">x-y=2</a>, xy=8</p><p>(x+y)^2=(x-y)^2+4xy(মান নির্ণয়ের সুত্র)</p><p>* (x+y)^2 =2^2+4x8</p><p>* (x+y)^2 =4+32=36</p><p>*(x+y)=√36</p><p>*(x+y)=±6</p>
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