[tex]DKXD:x\geq 0[/tex]
Ta có:
[tex]PT\rightarrow (x^3+8)+(6x^2+12x)-8x\sqrt{x}=0\\\rightarrow (x+2)(x^2-2x+4)+6x(x+2)-8\sqrt{x^3}=0\\\rightarrow (x+2)(x^2+4x+4)-(2\sqrt{x})^3=0\\\rightarrow (x+2)(x+2)^2-(2\sqrt{x})^3=0\\\rightarrow (x+2)^3-(2\sqrt{x})^3=0\\\rightarrow (x+2-2\sqrt{x})((x+2)^2+4\sqrt{x}(x+2)+4x)=0[/tex]
Do [tex]x\geq 0[/tex] tự CM 2 cái ngoặc kia > 0 nhé
-> Vô nghiệm