\(\frac{x^2}{\left(x+2\right)^2}+3=3x^2-6x\left(đkxđ:x\ne-2\right)\)
\(< =>\frac{x^2}{\left(x+2\right)^2}=3x^2-6x-3\)
\(< =>x^2=\left(3x^2-6x-3\right)\left(x^2+4x+4\right)\)
\(< =>x^2=3x^4+12x^3+12x^2-6x^3-24x^2-14x-3x^2-12x-12\)
\(< =>3x^4+6x^3-16x^2-26x-12=0\)
Đến đây dễ rồi ha !