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# Grade 8 Chapter 11

### Exponential and Radical Functions

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

common ratio | In a geometric sequence, the constant ratio of any term and the previous term. |

compound interest | Interest earned or paid on both the principal and previously earned interest. |

exponential decay | An exponential function of the form f(x)= ab^x in which 0<b<1. |

exponential function | A function of the form f(x)=ab^x, where a and b are real numbers with a not equal to 0, b>0 and b is not equal to 1. |

exponential growth | A function of the form f(x)=ab^x in which b>1. |

extraneous solution | A solution of a derived equation tat is not a solution of the original equation. |

geometric sequence | A sequence in which the ratio of successive terms is a constant r, called the common ratio. |

half-life | The time it takes for one-half of the substance to decay into another substance. |

like radicals | Radical terms having the same radicand and index. |

radical equation | An equation that contains a variable within a radical. |

radical expression | An expression that contains a radical sign. |

radicand | The expression under a radical sign. |

square-root function | A function whose rule contains a variable under a square-root sign. |

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bookannelid