c: \(\Leftrightarrow\left(x+1\right)\left(x^2-x+1\right)=\left(x+1\right)\left(x-5\right)\)
\(\Leftrightarrow x+1=0\)
hay x=-1
d: \(\Leftrightarrow\left(x+1\right)\left[\left(x+1\right)^2-9\right]=0\)
=>(x+1)(x-2)(x+4)=0
hay \(x\in\left\{-1;2;-4\right\}\)
e: \(\Leftrightarrow\left(x+2+x+1\right)\left(x^2+4x+4-x^2-3x-2+x^2+2x+1\right)=0\)
=>2x+3=0
hay x=-3/2
g: \(\Leftrightarrow\left(x+1\right)^3+\left(x-1\right)^3=0\)
=>x+1+x-1=0
=>2x=0
hay x=0
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