Question

[trịnh văn hải]

 căn bậc hai(x^2) -3*x+2

Answer 1

[Dora]

`\sqrt{x^2}-3x+2`

`=|x|-3x+2`

`@TH1:`\(x \ge 0=>|x|=x\)

  `=>x-3x+2=-2x+2`

`@TH2:x < 0=>|x|=-x`

   `=>-x-3x+2=-4x+2`