The calculation rule is used to calculate the roots of 1st, 2nd, 3rd or 4th grade equations. The equation takes the following form:

n^th grade equation:

If real numbers are entered for ai, the result is calculated and given in real and/or imaginary numbers. If a string is entered for one or more ai, the calculation rule gives the analytical solution. A string consists of several symbols or letters.

Reference:

[a] Wiskundig softwarepakket MAPLE. Release 2.0A Micro Soft.

(For this the 'solve' option is used).