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The square roots of 121 are -11 and 11.
The two square roots are -22 and +22.
The square roots (not sqare route!) of 99999999999999999999999 are ±316,227,766,016.8 approx.
The roots of the equation
If the discriminant of the quadratic equation is zero then it will have 2 equal roots. If the discriminant of the quadratic equation is greater than zero then it will have 2 different roots. If the discriminant of the quadratic equation is less than zero then it will have no roots.