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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 |
Created by:
AoifeButler
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