In this worksheet the questions consist of factorising trinomials when a = 1 and c is negative. This means that the solution takes the form (x + y)(x - z) where y and z are factors of c that subtract to get to b. This worksheet also has a fully worked out memo.  

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Factorising Trinomials with negative c and a = 1 Factorising Trinomials with negative c and a = 1 - Memo