\(Q=2\left(x^2+x-6\right)-\left(5x^2-4x\right)+\left(3x^2-6x\right)+7\)
\(=2x^2+2x-12-5x^2+4x+3x^2-6x+7\)
\(=\left(2x^2-5x^2+3x^2\right)+\left(2x+4x-6x\right)+7-12\)
\(=0+0+-5=-5\) ko phụ thuộc x
\(M=\left(3x^2-x\right)-\left(x^3+3x^2\right)+\left(x-1\right)\left(x^2+x+1+1\right)\)
\(=3x^2-x-x^3-3x^2+\left(x-1\right)\left(x^2+x+1\right)+\left(x-1\right)\)
\(=-x-x^3+x^3-1+x-1\)
\(=-2\) (ko phụ thuộc x)