Question

$\sqrt{x {}^{2} } + x + 1 = x + 2 =$
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Answer 1

Răspuns:    S={-1,1}

√x²+x+1=x+2

lxl+x+1=x+2

Caz  x≥0

x+x+1=x+2

x+1=2

x=3-1=1

Caz x<0

-x+x+1=x+2

1=x+2

1-2=x

-1=x

Explicație pas cu pas: