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(x+1)^2 - 9
trebuie descompus in factori


Răspuns :

a^2-b^2=(a+b)(a-b)

(x+1)^2 - 9

a= x+1
b= 3

(x+1)^2 - 9= (x+1+3)(x+1-3)= (x+4)(x-2)