12. Factor.

7x2 + 29x + 24

Here it is not quite so obvious how to break the middle term up to recover the O and I terms. But if we multiply the first and last coefficients, and survey all possible ways to multiply two number to get that product,

and we find a pair of numbers that will work:

F     O     I     L

7x2 + 21x + 8x + 24

which comes from

(7x + 8)(x + 3)

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