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Calculati:
E(x)=x^3 - 10x^2 - x + 10
Arata ca E(x) = 0


Răspuns :

E(x) = x(x-1)(x+1) -10(x-1)(x+1) = (x-1)(x+1)(x-10), am folosit formula x^2 - 1=(x-1)(x+1)
E(x) = 0 pentru
x1= -1
x2= 1
x3 = 10
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