Answer
By trial and error, the first terms of the binomial factors must have a product equal to the coefficient of the squared variable. The last terms of the binomial factors must have a product equal to the constant (or the third term of the trinomial). Then use the FOIL Method and check if the tested factors will give the correct middle term.
Work Step by Step
Find factors of the squared variable and factors of the last term. Then use FOIL if the tested factors will result to the correct middle term of the given trinomial.
