CBSE Class 10 Answered
If -5 is a root of the quadratic equation 2x2+ px –15 = 0 and the quadratic equation p(x2+ x)k = 0 has equal roots, find the value of k.
Asked by bishnoi.harsh.07 | 15 Feb, 2019, 17:34: PM
Expert Answer
f(x)=2x2+ px –15 = 0
f(-5)=2(-5)2+ p(-5) –15 = 0
p=35/5=7
p(x2+ x)k = 0
(pk)x2+ (pk)x=0
has equal roots
b2-4ac=0
p2k2=0
k=0
Answered by Arun | 17 Feb, 2019, 13:13: PM
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