Answer
We need the middle term to be -2x.
Work Step by Step
You can use a guess and check method here. We know that one of the terms is positive, while the other is negative. Thus, try one combination, and expand the binomial. If you guessed correctly, you can use the FOIL method and get a middle term of -2x. If you get 2x instead, simply switch the signs in the initial binomial.
