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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 p...

So to begin we need factors of 12.

12 and 1, 3 and 4.

Then we need to think of a way of adding or subtracting to give -1.

So we can have 4 and -3.

which gives (x+4)(x-3).

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