Use Pascal's triangle to expand the expression. (x + y)7

Question

Use Pascal's triangle to expand the expression.

(x + y)⁷

Answer 1

Hello Isaiah

 

When you refer to the Pascal's triangle; Each number is formed by adding the two numbers above to the left and right.

The last row gives us the coefficients we need:

(x+y)7

=x⁷+7x⁶y+21x⁵y²+35x⁴y³+35x³y⁴+21x²y⁵+7xy⁶+y⁷

^{hope that helps}