CK-12: Andrew Gloag, Anne Gloag, and Eve Rawley's "Factorization of Quadratic Expressions with Negative Coefficients"

Work through Example E. In this example, the issue of factoring a trinomial with a = -1 is avoided by factoring (-1) out. Then, the resultant trinomial has the form of x2 + bx + c and can be factored as such. Then, work on practice problems 13-16 and 18. Once you have completed the practice problems, check your answers against the answer key.