Question

x(x+1)-(x-2)(x+1)=0
tìm x 
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Answer 1

x(x+1)-(x-2)(x+1)=0

\(\left(x+1\right)\left(x-x+2\right)=0\\ \left(x+1\right)\cdot2=0\\ =>x+1=0\\ x=0-1\\ x=-1\)

Answer 2

=>(x+1)(x-x+2)=0

=>x+1=0

=>x=-1