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Quartic Root Calculator  

This calculator computes complex and real roots for any quartic polynomial. It applies the LinBairstow algorithm which iteratively solves for the roots starting from random guesses for a solution. The calculator is designed to solve for the roots of a quartic polynomial with the form: x^{4} + a·x^{3}+ b·x^{2} + c·x + d = 0 The program is operated by entering the coefficients for the quartic polynomial to be solved, selecting the rounding option desired, and then pressing the Calculate button. All entries are cleared by pressing the Clear button. If the value of d is zero (which means that one root is zero), the program returns an error message: cannot solve In this case, the quartic polynomial can be reduced to a cubic which cannot be solved using this calculator; try the Cubic Root Calculator. It is possible for the initial random guesses used by the algorithm to cause it to be unstable; the above error message will result in this instance. Each time the algorithm is started, a new set of initial random guesses will be generated  another trial may result in a solution


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