Because every x is 3.

So we can get from Vieta's theorem.

X 1X2=-6

So X2=-6/X 1=-6/3=-2.

That is, the other root of x is -2.

Then x1+x2 =-k.

Equal to 3+(-2)= 1

2. Solution:

Because it comes from Vieta's theorem

X 1+X2=-(4/2)=-2

X 1*X2=M/2

So from the title,

X 1+X2=X 1*X2=-2

That is, M/2=-2

So M = 2 *(2)=-4.