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2x²+16x+2
Don't start out trying to use the AC method first.
Always look for a common factor first. The AC method
will wait till later -- if it can be used at all.
First factor out the common factor 2:
2(x²+8x+1)
As it turns out it is not factorable any further. So
the AC method will not work here. So the final factored
form is simply
2(x²+8x+1)
Edwin