natashadag natashadag

01-01-2017
Mathematics

contestada

Write the first three terms in the binomial expansion, expressing the result in simplifies form.
(x+4)^20
I know that the answer is x^20+80x^19+3040x^18, but i need an explanation on the steps of how to get it. Thanks!

Respuesta :

royalranger royalranger

01-01-2017

You need to foil it out. That's how you get the answer.

(x+4)^20
=
(x+4) x (x+4)^19
=
(x+4)^2 x (x+4)^18
etc.

Answer Link

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