ĐKXĐ: \(x\ne-2\)
\(\leftrightarrow\)\(\left(x+1\right)^2+\dfrac{\left(x+1\right)^2}{\left(x+2\right)}-8=0\)
\(\leftrightarrow\)\(\dfrac{\left(x+1\right)^2.\left(x+2\right)}{x+2}+\dfrac{\left(x+1\right)^2}{x+2}-\dfrac{8.\left(x+2\right)}{x+2}=0\)
\(\rightarrow\)\(\left(x+1\right)\left(x+1\right)\left(x+2\right)+\left(x+1\right)\left(x+1\right)-8\left(x+2\right)=0\)
\(\leftrightarrow\)\(x^3+4x^2+5x+2+x^2+2x+1-8x-16=0\)
\(\leftrightarrow\)\(x^3+5x^2-x-13=0\)
\(\leftrightarrow\)╚(•⌂•)╝╚(•⌂•)╝╚(•⌂•)╝╚(•⌂•)╝╚(•⌂•)╝╚(•⌂•)╝╚(•⌂•)╝
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