Question
If p, q are roots of an equation x2+5x+2=0 , then find out the value of pq+qp.
Answer: Option C
:
C
Sum of the roots:p+q=−5
Product of the roots:pq=2
pq+qp=(p2+q2)pq=[(p+q)2−2pq]pq=[(p+q)2]pq−2=252−2=212
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:
C
Sum of the roots:p+q=−5
Product of the roots:pq=2
pq+qp=(p2+q2)pq=[(p+q)2−2pq]pq=[(p+q)2]pq−2=252−2=212
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