Question

if 3 is the root of a quadratic equation x^2+px+9=0 and quadratic equation x^2+px+k=0 has equal roots then find k

Answer 1

(3)2+P3+9=0
9+3p+9=0
18+3p
3p=-18
P=-6
(3)2-6*3+k=0
9-18+k=0
k=9

Answer 2

k=9 is the answer of above question