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## Main Question or Discussion Point

I find it difficult to expand a trinomial using the formula method (factorial method) where you can find the coefficient of any term without expanding the whole trinomial.

I can understand the binomial, but I can't do the trinomial using the general sigma notation method.

Can someone please show me how to do this by using about 2 examples?

Thanks alot

I can understand the binomial, but I can't do the trinomial using the general sigma notation method.

Can someone please show me how to do this by using about 2 examples?

Thanks alot