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A biquadratic is a polynomial which involves only the second and fourth powers of a variable.
z5 is an expression, not an equation and so cannot have roots.
To find the roots (solutions) of a quadratic equation.
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.