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More difficult problems when leading coefficient is not 1. Step-by-step instructions on the method to factor trinomials.
This provides explanations to the basic factoring trinomials problems. Multiple examples are available.
This page breaks down the steps of multiplying two binomials to get a trinomial then explains that factoring is that process but working backwards. This page shows factoring with the leading coefficient being 1.
This page provides a video that explains the process of factoring as well as examples that are worked out step by step.
