click below

click below

Normal Size Small Size show me how

# Algebra Terms

### Key Terms for Junior Cert

Term | Definition |
---|---|

Variable | a letter or symbol used to represent a value that can change |

Coefficient | a number that comes in front of a variable |

Constant | a value that does not change |

Algebraic expression | may contain variables, constants, and operations |

Power | an expression written with an exponent and a base or the value of such an expression |

Square root | a number that is multiplied by itself |

Natural numbers | counting numbers: 1,2,3,... |

Integers | whole numbers that are negative and positive which include 0 |

Rational numbers | can be expressed in the forms a/b |

Reciprocal | the flip of a number |

Irrational numbers | cannot be expressed in the form a/b. They include square roots and nonterminating decimals that do not repeat |

Factor | Something multiplying something else |

Linear | an expression in which the highest power of any variable term is one |

Quadratic | an expression in which the highest power of any variable term is two. |

Simplify | to change an expression into it's factors |

Solve | to find the value or values of the variable that makes a statement true …. find the value of x |

Equation | a mathematical sentence that shows that two expressions are equal; this will always have an = sign |

Inequality | a mathematical sentence indicating that two quantities are not equal |

Bisect | to divide into two equal parts |

Arrange | to arrange in groups, by some property |

Degree | a measure for angles |

Evaluate | to calculate the value of |

Expand | when we remove the brackets and multiply |

Hypotenuse | the side opposite the right angle in a right-angled triangle |

Horizontal | parallel to the horizon |

Parallel | always the same distance apart and never touching |

Percentage | parts per 100 |

Probability | the chance that something will happen |

Tangent | a line that just touches a curve at a point only once |

Set | a collection of "things" |

Surface Area | the area of an object you can touch |

Slope | how steep a straight line is |

Triangle | a 3-sided shaped where the internal angles add to 180 |

Equilateral Triangle | all the angles are equal in measure and the side lengths are the same length |

Isosceles Triangle | two equal sides and two equal angles |

Axes | usual meaning: the "x" and "y" lines that cross at right angles to make a graph |