Using area model:
https://www.youtube.com/watch?v=KGJBAJ9cHwo
Another explanation:
https://www.youtube.com/watch?v=SWtQGRNKHOU
In English:
https://www.khanacademy.org/math/algebra-basics/quadratics-polynomials-topic/factoring-quadratic-expressions-core-algebra/v/factoring-quadratic-expressions
In Spanish:
https://es.khanacademy.org/math/algebra-basics/quadratics-polynomials-topic/factoring-quadratic-expressions-core-algebra/v/factoring-trinomials-with-a-common-factor
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