descompuneti 1-x+2x²

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Răspuns :

x^2 +x^2 - x +1

Rearanjam termenii convenabil pt a scoate apoi factor comun. Ecuatia devine:

x^2-1 + x^2-x=

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

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

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