The complex numbers (1/2 + √11/2 i) and (1/2 - √11/2 i)
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It is: 3x2+6x-11 = 0
(x, y) = (-3, -3) or (3, 3)
The centre is (-5, 3)
Yes.
The missing number is 49. This is why: 1 plus 2 equals 3, then 3 squared is 9. 2 plus 3 equals 5, then 5 squared is 25. Therefore, the missing number must be 49 to make the number sentence (3 plus 4 equals 7, then 7 squared is 49) true.