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Rezultatul calculului:
(x-6) (x+1) - 2(x+1) (x+9)=


Răspuns :

X²+x-6x-6-2(x²+9x+x+9)= Apoi calculezi
x^2+x-6x-6-(2x-2)(x+9)=
x^2+x-6x-6-2x^2-18x-2x-18=
x^2-x-24x-24-2x^2=
x^2-25x-24-2x^2=x^2(1-2)-25x-24
-x^2-25x-24
a=-1
b=-25
c=-24
D=[tex] \sqrt{529} [/tex]=23
x1,x2=-1,-24