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Sa se descompuna in factori,dand factor comun:

a)x(x+1)+[tex](x+1)^2[/tex]-4(x+1)


Răspuns :

x²+x+x²+2x+1-4x-4=
2x²-x-3=0
(x+1)(x-3/2)=0
x1=-1
x2=3/2