cine ma ajuta ?
2x la puterea 3=x la puterea 2-x+2


Răspuns :

2x³=x²-x+2⇔2x³-x²+x-2=0⇔(2x³-2)-(x²-x)=0⇔2(x³-1)-x(x-1)=0⇔
⇔2(x-1)(x²+x+1)-x(x-1)=0⇔(x-1)(2(x²+x+1)-x)=0⇔(x-1)(2x²+x+2)=0⇔
x₁-1=0⇔x₁=1;
2x²+x+2=0⇔x∉R;
Bafta!


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