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Determinan Q = 2x^2 - 6
Det P = Det Q
3x^2 - 4x = 2x^2 - 6
x^2 - 4x + 6 = 0
Note :
aX^2 + bX + C = 0
Berarti, dari persamaan di atas, a=1, b=-4, dan c=6
X1+X2 = -b/a dan X1.X2=c/a
X^2 + X^2 = (X1+X2)^2 - 2.X1.X2
*penjabaran
X1^2 + X2^2 = (-(-4)/1)^2 - 2.(6/1)
X1^2 + X2^2 = 16 - 12 = 4