Question

How do you add `(a^3 - 2a^2) - (3a^2 - 4a^3)`?

Answer 1

`(a^3 - 2a^2) - (3a^2 - 4a^3)`
`=a^3 - 2a^2 - 3a^2 + 4a^3`

We group the Like Terms

`= (a^3+4a^3) + (- 2a^2 - 3a^2)`
`= color(green)(5a^3 - 5a^2`