Factorise x^2-7x+12
First write down all the factor pairs of 12 (1,12) (-1,-12) (3,4) (-3,-4) (6,2) (-6,-2).
From these factors, find a pair that, when added together, is equal to -7.
In this case the correct pair would be -3 and -4 as -3+-4 = -7
the solution is therefore (x-3)(x-4)
HD
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