Quadratic Equation Calculator
Cubic Equation Calculator

Input MUST have the format: AX⁴ + BX³ + CX² + DX + E = 0
EXAMPLE: The quartic equation: 3X⁴ + 6X³ – 123X² – 126X + 1,080 = 0
would be input: A= 3 B= 6 C= -123 D= -126 E= 1080
Click E N T E R and your answers should be 5 3 -4 and -6

1) Do NOT enter commas.
2) Make sure that you have entered a number in ALL boxes (A, B, C, D and E).
3) If you are entering an equation with a ‘missing’ term (for example, no X3 term, then enter it as zero. (Do NOT leave the field blank).

4) If an equation has a term with no coefficient, enter it as 1 (and not 0 or blank). For example, the equation X⁴ + 6X³ + 10X² + X   =   0   would be entered as:

A=1   B=6   C=10   D=1   E=0  NOTE: This calculator has been rigorously debugged.
However, if you think it may have calculated an incorrect answer, please send us an E-Mail.
And remember – you should always check your answers. Thank you.

To see the method for solving quartic equations, click HEREIf you want to use the “long hand” method for solving quartics, you may find the information in the boxes below very helpful to check your work as you go along.
Remember, doing this by hand is VERY laborious, time-consuming and the possibility for making errors is HUGE.