Question

given one of the roots equation X.X + K.X + 4 = 0 is four times the other root. find the value of K?

Answer 1

Let the roots be a,4a.       So, a+4a= -k/1, 5a= -k. again 4a*a=4/1, a=+1,-1. So k=-5a=-5,+5.Ans