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(x+1)^2 -1 =3, please


Răspuns :

(x+1)²-1=3
(x+1)²-1-3=0
(x+1)²-4=0
(x+1)²-2²=0
(x+1-2)(x+1+2)=0
(x-1)(x+3)=0
x1=1
x2=-3