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descompuneti in factori :a) 4x^2 -49;b)x^2+12x+35

Răspuns :

4x^2-49=(2x-7)(2x+7)
x^2+12x+35=
x^2+7x+5x+35
x•(x+7)+5(x+7)
(x+5)•(x+7)