# How do I use Pascal's triangle to expand #(2x + y)^4#?

##### 1 Answer

Jul 9, 2015

Write out the fifth row of Pascal's triangle and make the appropriate substitutions.

#### Explanation:

Pascal's triangle is

(from www.kidshonduras.com)

The numbers in the fifth row are 1, 4, 6, 4, 1.

They are the coefficients of the terms in a fourth order polynomial.

But our polynomial is