# Math Help - Expanding question

1. ## Expanding question

What does (x^3 - (3/x))^8 expand to?

2. When I tried computing the problem into the binomial calculator, it's not giving me an answer?

3. Via Pascal's triangle your coefficents are $1,8,28,56,70,56,28,8,1$

Using these the expansion is...

$1\times (x^3)^8\times \left(\frac{-3}{x}\right)^0+8\times (x^3)^7\times \left(\frac{-3}{x}\right)^1+28\times (x^3)^6\times \left(\frac{-3}{x}\right)^2+\dots
$

Do you see the pattern?