Question

How do you use the binomial formula to find expand `(x^2y - 1)^5`?

Answer 1

Detail in explanation

Explanation:

`（x^2y-1)^5`
`=5c5(x^2y)^5+5c4(x^2y)^4(-1)+5c3(x^2y)^3(-1)^2+5c2(x^2y)^2(-1)^3+5c1(x^2y)(-1)^4+5c0(x^2y)^0(-1)^5`