Sep 16, 2020 · First set the coefficients in different cells. Set the initial value of X as “0” in cell B6. After that write the polynomial equation in cell G3 with respect to the cells of coefficients and the initial value of X. Now, under the Data tab click on to the Goal Seek option under the Forecast option. This online calculator is a quadratic equation solver that will solve a second-order polynomial equation such as ax 2 + bx + c = 0 for x, where a ≠ 0, using the quadratic formula. The calculator solution will show work using the quadratic formula to solve the entered equation for real and complex roots. The Standard Form for writing a polynomial is to put the terms with the highest degree first. Example: Put this in Standard Form: 3 x 2 − 7 + 4 x 3 + x 6 The highest degree is 6, so that goes first, then 3, 2 and then the constant last: