Question

How do you factor `-9x ^ { 4} - 27x ^ { 3} + 45x ^ { 2}`?

Answer 1

`-9x^2(x^2 -3x+5)`

Explanation:

Start by taking out a common factor:

`-9x^2(x^2 -3x+5)`

This does not factor further, there are no factors of `5` which add to make `3`