यदि (p+q=9) और \(p^2+q^2=41\), तो (pq) क्या है?
If (p+q=9) and \(p^2+q^2=41\), what is (pq)?
Explanation opens after your attempt
A. (20)correct value
Concept
((p+q)2=p-2+q-2+2pq), so (81=41+2pq) and (pq=20). In exams find (2pq) first.
Why this answer is correct
The correct answer is A. (20) / correct value. ((p+q)2=p-2+q-2+2pq), so (81=41+2pq) and (pq=20). In exams find (2pq) first.
Exam Tip
((p+q)2=p-2+q-2+2pq), इसलिए (81=41+2pq) और (pq=20) है। परीक्षा में (2pq) पहले निकालें।
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