Question

How do you multiply `-3r \cdot - 6r ^ { 3}`?

Answer 1

`-3rxx-6r^3=18r^4`

Explanation:

`-3rxx-6r^3=(-3xx-6)xx(rxxr^3)`

`(18)xx(r^4)=18r^4`

So all I did here was to separate the factors, and adjust the signs and exponents appropriately.