Two videos on my youtube channel:
First, to be able to factor trinomials you need to understand what happens when you multiply two binomials:
https://www.youtube.com/watch?v=ROrc2M8XjGk&pp=2AYQ
Then, using that understanding, you can learn to undo multiplication, that is, to factor:
https://www.youtube.com/watch?v=YaawSgaqGpE
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