Answer:
If you understand it, you will remember it, so try to explain everything in the most simplest way, so that you could understand it. Also khan academy helps
Step-by-step explanation:
(3x-4y)×(3x-4y-(3x+4y))
(3x-4y)×(3x-4y-3x-4y)
(3x-4y)×(-8y)
-8y×(3x-4y
Hope this help!!!
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Please see attached