Jawapan

2015-09-28T09:46:16+08:00
Let say the roots of equations are A and 2A

HTP = A + 2A = 3A
HDP = A (2A) = 2A^2

x^2 - (HTP)x + HDP = 0
x^2 - 3Ax + 2A^2 = 0 

2x^2 + px + q = 0
x^2 +px/2 + q/2 = 0

-p/2 = 3A
p = -6A

q/2 = 2A^2
q = 4A^2