If -5 is a root of quadratic equation 2x^ +px-15=0and the quadratic equation p(x^+x)+k=0has equal roots then find the value of k
Answers
Answered by
3
f(x)=2x2+px-15
f(5)=2*5^2+p(5)-15
= 2*25+5p-15
=50-15+5p
35+5p=0
5p=-35
p=35/5=7
f(5)=2*5^2+p(5)-15
= 2*25+5p-15
=50-15+5p
35+5p=0
5p=-35
p=35/5=7
Similar questions