`(2x+3)^2-(x-2)^2-(x-1)^2=5`

  `<=>`  `4x^2+9+12x-x^2+4x-4-x^2+2x-1=5`

  `<=>`  `2x^2+18x-1=0`

  `<=>`  `x^2+9x-1/2=0`

  `<=>`  `(x+9/2)^2-83/4=0`

  `<=>`  `(x+9/2-\sqrt{83}/2)(x+9/2+\sqrt{83}/2)=0`

  `<=>`   `x=(\sqrt{83}-9)/2`  `hoặc`  `x=(-\sqrt{83}-9)/2`

               `x^3+8-(x+2)(-x^2-x+10)=0`

  `<=>`   `(x+2)(x^2-2x+4)-(x+2)(-x^2-x+10)=0`

  `<=>`    `(x+2)(x^2-2x+4+x^2+x-10)=0`

  `<=>`   `(x+2)(2x^2-x-6)=0`

  `<=>` $\left[\begin{matrix} x+2=0\\ 2x^2-x-6=0\end{matrix}\right.$

 `<=>`  $\left[\begin{matrix} x=-2\\ (x-2)(2x+3)=0\end{matrix}\right.$

 `<=>`  $\left[\begin{matrix} x=-2\\ x=2\\ x=\frac{-3}{2}\end{matrix}\right.$