A quadratic equation is one that can be written out in the form axe^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.

- Skill level:
- Moderately Easy

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## Instructions

- 1
Check that the equation to be solved is written out in standard form, axe^2 + bx + c = 0. If not, rewrite the equation as necessary.

- 2
Press the "Mode" button repeatedly until "EQN" appears on the screen. Press "1" to enter the equation calculation mode.

- 3
Press the right arrow key followed by "2" to select a quadratic equation.

- 4
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.

## MS models

- 1
Rewrite the equation into standard form, if necessary.

- 2
Press the "Mode" key followed by "5" to enter the equation calculation mode.

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

- 4
Input the values of a, b and c into the appropriate cells.

- 5
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.

## ES models

#### Tips and warnings

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