Factoring Trinomials, a is not 1 - Problem 7 458 views
We need to treat factoring trinomials differently when the leading coefficient, "a," is one than when it is not one. In the examples presented here, "a" is prime, which means we know the first terms of the two binomial factors. From there, they may be some guessing and checking (using FOIL to multiply) to find the second terms.
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