We can solve quadratic equations in excel by inputting an equation that contains our variable (e.g. X), then we would define X using a formula. Thereafter, we would use this quadratic formula to solve for X using some given roots of the equation. This tutorial will teach use how to solve quadratic equation in excel.
Figure 1: Solving quadratic equations
Data for Solving Quadratic Equation
- To do this, we will type in our quadratic equation
y = a + bx + cx^2and also define the root of the variable “X” by typing this quadratic formulax0 = [-b ± SQRT(b^2 - 4ac]/2a
Figure 2: Quadratic formula
- We will now prepare a table for the roots of “X” which are “x1” and “x2”, and ascribing values for the variables in the equation of “X” which are “a, b, and c”
Figure 3: Table of roots
- We will type this formula into Cell B11
=(-B8+SQRT(B8^2-4*B7*B9))/(2*B7)
Figure 4a: Formula for the positive root of the equation
- We will now press the enter key
Figure 4b: Answer for the positive root of equation
- We will now repeat the same operation for “x2” by copying, pasting and changing “+” sign into a “–“minus sign in the formula in Cell B12 as =(-B8-SQRT(B8^2-4*B7*B9))/(2*B7)
Figure 5a: Formula for the negative root of the equation
- We will now press the enter key
Figure 5b: Solved quadratic equation
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