what is the constant term in
I see you have graph paper.
You must be plotting something
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
You need to calculate the coefficent where the z term is (z to the power zero).
That will be
So 9C3 x 2^6
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