Si x=1+1+1+1+… alors :\text{Si } x=\sqrt{1+\sqrt{1+\sqrt{1+\sqrt{1+\ldots}}}} \text{ alors :}
A. x2 – x – 1 = 0,
B. x2 + x – 1 = 0,
C. x2 – x + 1 = 0,
D. x2 + x + 1 = 0,
E. x2 – 1 = 0.