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

and also define the root of the variable “**y = a + bx + cx^2****X**” by typing this quadratic formula**x0 = [-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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