Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

value of k
Asked by | 26 Aug, 2008, 11:00: AM
answered-by-expert Expert Answer

 2x+ 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(x+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
CBSE 10 - Maths
Asked by hanugraha | 30 May, 2010, 07:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by hanugraha | 30 May, 2010, 07:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by 2806rahul | 30 May, 2010, 09:28: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shobhitdc | 29 May, 2010, 04:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by ROJAAPPA | 29 May, 2010, 12:58: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shobhitdc | 29 May, 2010, 11:59: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shobhitdc | 29 May, 2010, 10:52: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by devanshmudgal | 28 May, 2010, 07:31: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shobhitdc | 28 May, 2010, 01:12: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by shobhitdc | 28 May, 2010, 01:08: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×