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Descompuneti in factori expresiile:
a) 81-4x^2=
b) a^2+10a+25=
c)4x^3-4x^2+x=


Răspuns :

a) 81-16x =
(9-4x)(9+4x)
b) a² +10a+25=
(a+5)²
c) 64x-16x+x=
(64-16-1)x → 57x