Bài 29:
a: \(\Leftrightarrow x^3+5x^2-2x-x^2-5x+2-x^3+1=0\)
\(\Leftrightarrow4x^2-7x+3=0\)
=>(x-1)(4x-3)=0
=>x=1 hoặc x=3/4
b: \(\Leftrightarrow x^2+11x^2-7x+22x-14-4=0\)
\(\Leftrightarrow12x^2+15x-18=0\)
\(\Leftrightarrow4x^2+5x-6=0\)
\(\Leftrightarrow4x^2+8x-3x-6=0\)
=>(x+2)(4x-3)=0
=>x=-2 hoặc x=3/4
c: \(\Leftrightarrow\left(x+1\right)\left(x^2-x+1\right)-x\left(x+1\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x-1\right)^2=0\)
=>x=-1 hoặc x=1
d: \(\Leftrightarrow\left(x+1\right)\left(x^2+1\right)=0\)
=>x+1=0
hay x=-1
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