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Arătați ca :(x-1)(x la a doua - 1)-4(x+1)=(x+1) la puterea A doua (x-3)

Răspuns :

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

(x - 1) (x + 1)(x - 1) - 4(x + 1) =

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

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

(x + 1) ( x + 1) (x - 3) =

(x + 1)^2 (x - 3)