Question

[Hân Đào]

1/3(1-4x)(x-1) +4(3x-2) (x+3)=-27

2/ (x+3) (x^2 -3x+9)-x(x-1)(x+1)=27

Answer 1

[Nguyễn Việt Lâm]

1/

\(3\left(-1-4x^2+5x\right)+4\left(3x^2+7x-6\right)=-27\)

\(\Leftrightarrow-3-12x^2+15x+12x^2+28x-24=-27\)

\(\Leftrightarrow43x=0\Rightarrow x=0\)

2/

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x^2-1\right)=27\)

\(\Leftrightarrow x^3+27-x^3+x=27\)

\(\Leftrightarrow x=0\)