यदि (m-n=4) और \(m^2+n^2=34\), तो (mn) क्या है?
If (m-n=4) and \(m^2+n^2=34\), what is (mn)?
Explanation opens after your attempt
A. (9)correct value
Concept
((m-n)2=m-2+n-2-2mn), so (16=34-2mn) and (mn=9). In exams pay attention to the sign.
Why this answer is correct
The correct answer is A. (9) / correct value. ((m-n)2=m-2+n-2-2mn), so (16=34-2mn) and (mn=9). In exams pay attention to the sign.
Exam Tip
((m-n)2=m-2+n-2-2mn), इसलिए (16=34-2mn) और (mn=9) है। परीक्षा में चिन्ह पर ध्यान दें।
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