In this tutorial the instructor shows how to factor a trinomial with Greatest Common Factor (GCF) and then how to group it. The first thing you have to do when you want to factor a trinomial is look for the GCF. First factor the numerical coefficients of the terms of the equation. Now separate out the common numerical factor and if any common variable. This leaves you with a binomial to be factored. Now to solve this multiply the numerical coefficients of the first term and the last term and now factorize the obtained value such that adding them gives the value of the middle term coefficient. The instructor shows how to do this using an example. Now you can split the middle term corresponding to the factors obtained in the previous step. Now you can do the grouping there by factorizing the equation. This video shows how to factor a trinomial by GCF and grouping.
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