Level 2

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algebra

a branch of mathematics where numbers are represented by symbols, usually letters.

algebraic expression

a group of terms that are joined by addition or subtraction signs

binomial

an algebraic expression consisting of two terms (for example; 2x + 3y)

denominator

the bottom of a fraction

difference of two squares

The result of multiplying two binomials which are the sum and difference of the same terms

expand

To remove grouping symbols by multiplying the terms in each pair of grouping symbols by the term or terms outside.

like terms

Terms that have identical pronumeral parts. (for example 7x and 10x or 5ab and −3ab)

numerator

the top of a fraction

parenthesis or brackets

the name given to these grouping symbols; ( )

perfect square

When a binomial is multiplied by itself. eg (x + 5)^2 or (2a − 3b)^2

pronumeral or variable

A symbol, usually a letter, that is used to represent a number.

substitution

The replacing of a pronumeral with a numeral in an expression. For example; to substitute 3 for a in the expression 4a − 2 would give: 4(3) − 2 = 10