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Question
m + n = 12 এবং m - n = 2 হলে mn এর মান কত?
35
70
140
148
ANSWER : 1
Descrption
<p> দেওয়া আছে, m + n = 12 এবং m - n = 2 তাহলে, mn = ?</p> <p>আমরা জানি, (m - n)<sup>2</sup> = (m + n)<sup>2</sup> - 4mn</p> <p> বা, (2)<sup>2 </sup> = (12)<sup>2 </sup> - 4mn</p> <p> বা, 4 = 144 - 4mn</p> <p> বা, 4mn = 144 - 4</p> <p> বা, mn = 140/4</p> <p> অতএব, mn = 35 </p>
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