expression, collection of terms involving variables (letters) and numbers, simplify, write an expression in a simpler equivalent form, variable, symbol, usually a letter, that can represent any value in mathematical expressions, identities and formulae, like terms, terms with the same variable(s) and power(s), unlike terms, terms with different variable(s) and power(s), expand, multiply each term inside the bracket by the expression outside the bracket, coefficient, number in front of a variable indicating the multiple of the variable, index, written as a small number to the right and above the base number, which indicates how many times the base has been multiplied by itself, factorise, express an algebraic expression as a product of its factors using brackets, the reverse process of expanding brackets, highest common factor (HCF), common factor of two or more integers or terms that has the greatest value or power

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