Originally Posted by

**flexus** ok i just want someone to double check my work please. for some reason i think i have the wrong answer.

(use the binomial theorem to expand and simplify this expression)

(x-y)^8

ok so i used pascal's triangle ...the pascal triangle in my book stops at the 7th row so i got this for my 8th row 1,8,28,56,70,56,28,8,1

so this is what i got ...Please check my work.

$\displaystyle 1x^8-8x^7y+28x^6y^2-56x^5y^3+70x^4y^4-56x^3y^5+28x^2y^6-8xy^7+1y^8$

ok i know this looks confusing but if you copy and paste it into online calculator it should put everything into place. Did i do this right???