## Precalculus: Mathematics for Calculus, 7th Edition

$(x - 4)(x + 2)$
Since there is no coefficient on the first term, you just find two factors of the third term, in this case -4 and 2, that add to the coefficient of the middle term, -2. Each of these is then inserted into a binomial expression with x as the other term, giving $(x - 4)(x + 2)$