factor - a number that divides into another, HCF - highest common factor, to factorise HCF - pull out HCF, find the terms that multiply by this to give the original expression, grouping - 4 pairs of terms with variables/coefficients/numbers in common, factorising by grouping - pairs of terms that are factorised, what's common is then pulled out and multiplied by what's left over, quadratic trinomials - ax² + bx + c, factorising quadratic trinomials - factorise the x², factorise the constant, use the factors that add to give the x term in the middle, in a quadratic trinomial if the constant is negative - the constant factors will be one plus, one minus, in a quadratic trinomial if the constant is positive - the constant factors will be both either be plus or both minus, difference - the answer after subtraction, square - to multiply a term by itself, difference of two squares - a² - b² = (a + b)(a - b),

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