Question

How do you expand `(a-2)^4`?

Answer 1

`a^4-8a^3+24a^2-32a+16`

Explanation:

`(a-2)^2 times (a-2)^2`
`(a^2-4a+4)^2`
`a^4-4a^3+4a^2-4a^3+16a^2-16a+4a^2-16a+16`
`a^4-8a^3+24a^2-32a+16`