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# Algebra Terms

### Key Terms for Junior Cert

TermDefinition
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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