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# Algebra 1 Chapter 9

### McDougal Littell

Question | Answer |
---|---|

Square Root | I b sqaured=a then b is a square root of a. |

Positive Square Root | One of two square roots of a positive number. |

Negative Square Root | Any of the numbers less than zero. |

Radicand | The number or expression inside a radical symbol. |

Perfect Square | A number whose square roots are integers or quotients of integers. |

Irrational Number | A number that cannot be written as the quotient of two integers. |

Radical Expression | |

Quadratic equation in standard form | |

Leading coefficent | The coefficient of the first term in a polynomial written in |

Simplest form of a radical expression | An expression that has no perfect square factors other than 1 in the radicand, no fractions in the radicand, and no radicals appearing in the denominator of a fraction. |

Quadratic Function in Standard Form | A function written in the form y=ax2+bx+c |

Parabola | The u-shaped graph of a quadratic function. |

Vertex | The lowest point of a parabola that opens up or the highest point of a parabola that opens down. |

Axis of symmetry | The line passing through the vertex that divides the parabola into two symmetric parts. |

Roots | The solutions of ax2+bx+c=0 |

Quadratic Formula | |

Discriminant | The formula used to find the solutions of the quadratic equation. |

Quadratic Innequalites | |

Graph of a quadratic Inequality |

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