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Answer:
-18
Step-by-step explanation:
A is at -30. AE = 12
So, E is -30+12 = -18
1. Each term in this polynomial has a common factor of
:

2. Not sure what the "vertical method" is, but I would guess it refers to some way of visualizing the distributive property.



3. You can use the same approach as in (2), or recall that
:


4. Recall that a difference of squares can be factored as
. So


1,2,9,4,12
hope this helps