Question

${x}^{3} + x - 2 = 0$
help please exercise​

Answer 1

Răspuns:

x³-x+2x-2=0

x(x²-1)+2(x-1)=0

x(x-1)(x+1)+2(x-1)=0

(x-1) [x×(x+1)+2]=0

(x-1) (x²+x+2)=0

x-1=0

x=1

x²+x+2=0 => € R