A quadratic equation is one that can be written out in the form ax^{2} + bx + c = 0 where a, b and c are whole numbers. Learning to solve quadratics is a mainstay of the algebra curriculum and usually requires a great deal of trial and error. Many of the advanced scientific calculators made by Casio, such as the fx-115ES and the fx-95MS, feature the ability to solve quadratics.

## MS models

## Check the Equation

Check that the equation to be solved is written out in standard form, ax^{2} + bx + c = 0. If not, rewrite the equation as necessary.

## Press Mode, then 1

Press the "Mode" button repeatedly until "EQN" appears on the screen. Press "1" to enter the equation calculation mode.

## Select the Quadratic Equation

Press the right arrow key followed by "2" to select a quadratic equation.

## Input Your Values

Input the values of a, b and c by entering a number then pressing the "=" sign. Scroll down to view the solutions to the equation.

## ES models

## Rewrite the Equation

Rewrite the equation into standard form, if necessary.

## Press Mode, Then 5

Press the "Mode" key followed by "5" to enter the equation calculation mode.

## Press 3

Press "3" to select to solve a quadratic equation. This will take you to the coefficient editor screen.

## Input Your Values

Input the values of a, b and c into the appropriate cells.

## Solve

Press the "=" button to see the solution to the equation. If additional solutions are available they will be displayed after more presses of the "=" button. You can also use the up and down arrow keys to scroll between solutions.

#### Warning

Not all the ES and MS models have the equation feature. Consult your user guide.