CBSE Class 10 Answered
value of k
Asked by | 26 Aug, 2008, 11:00: AM
Expert Answer
2x2 + px --15 ==0 has --5 as its root
so 2 (--5)2 +px -15 ==0 ==> 50 --5p --15 ==0 ==> p ==7
the given quadratic p( x2 + x) +k =0 becomes 7(x2 +x) +k =0 has equal roots
therefore b2 --4ac ==0 ( discreminent =0 is the condition for the equal roots)
72 -- 4 (7) (k) ==0 ==> 49 --28k =0 ==> k == 49 /28 == 7/4
k = 7 /4
Answered by | 26 Aug, 2008, 05:07: PM
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