How to solve a quadratic equation on a GDC (graphical display calculator). This explanation uses the TI-82/83/84 calculators.

1. Press Y= to select the equation entry menu.

2. Enter your quadratic equation followed by ENTER.

3. You could press press GRAPH but it is better to press ZOOM then press 6 or select ZStandard.

4. You will see a display of your graph. Press ZOOM again then press 1 or select ZBox

5. Once back on the graph display, use the cursor keys and press ENTER at the top left and bottom right to create a zoom box

By repeated zooming in and use of the TRACE function you can obtain an accurate estimate of where the curve crosses the x-axis.

1. Press Y= to select the equation entry menu.

2. Enter your quadratic equation followed by ENTER.

3. You could press press GRAPH but it is better to press ZOOM then press 6 or select ZStandard.

4. You will see a display of your graph. Press ZOOM again then press 1 or select ZBox

5. Once back on the graph display, use the cursor keys and press ENTER at the top left and bottom right to create a zoom box

By repeated zooming in and use of the TRACE function you can obtain an accurate estimate of where the curve crosses the x-axis.

## Software/Applets used on this page

## This question appears in the following syllabi:

Syllabus | Module | Section | Topic | Exam Year |
---|---|---|---|---|

AP Calculus AB (USA) | 1 | Algebra and Functions | Quadratic solving | - |

AP Calculus BC (USA) | 1 | Algebra and Functions | Quadratic solving | - |

AQA A-Level (UK - Pre-2017) | C1 | Algebra and Functions | Quadratic solving | - |

AQA AS Maths 2017 | Pure Maths | Algebra | Solving with Discriminants | - |

AQA AS/A2 Maths 2017 | Pure Maths | Algebra | Solving with Discriminants | - |

CBSE X (India) | Algebra | Polynomials | Zeros | - |

CCEA A-Level (NI) | C1 | Algebra and Functions | Quadratic solving | - |

CIE A-Level (UK) | P1 | Algebra and Functions | Quadratic solving | - |

Edexcel A-Level (UK - Pre-2017) | C1 | Algebra and Functions | Quadratic solving | - |

Edexcel AS Maths 2017 | Pure Maths | Quadratics | Solving with Discriminants | - |

Edexcel AS/A2 Maths 2017 | Pure Maths | Quadratics | Solving with Discriminants | - |

I.B. Higher Level | 2 | Algebra and Functions | Quadratic solving | - |

I.B. Standard Level | 2 | Algebra and Functions | Quadratic solving | - |

Methods (UK) | M1 | Algebra and Functions | Quadratic solving | - |

I.B. (MSSL) | 2 | Algebra and Functions | Quadratic solving | - |

OCR A-Level (UK - Pre-2017) | C1 | Algebra and Functions | Quadratic solving | - |

OCR AS Maths 2017 | Pure Maths | Equations and Quadratics | Solving with Discriminants | - |

OCR MEI AS Maths 2017 | Pure Maths | Quadratics | Solving with Discriminants | - |

OCR-MEI A-Level (UK - Pre-2017) | C1 | Algebra and Functions | Quadratic solving | - |

Pre-U A-Level (UK) | 1 | Algebra and Functions | Quadratic solving | - |

Scottish (Highers + Advanced) | HM2 | Algebra and Functions | Quadratic solving | - |

Scottish Highers | M2 | Algebra and Functions | Quadratic solving | - |

Universal (all site questions) | A | Algebra and Functions | Quadratic solving | - |

WJEC A-Level (Wales) | C1 | Algebra and Functions | Quadratic solving | - |