The video tutorial explains how to factor a trinomial when the leading coefficient a is equal to 1. It introduces the quadratic form x^2 + bx + c and demonstrates the factoring process using the diamond method. The tutorial covers identifying the greatest common factor (GCF), applying the diamond method to find two numbers that multiply to c and add to b, and verifying the factors using the FOIL method. The video concludes with a summary of the steps involved in factoring trinomials.

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