# How do you factor #81r^3 - 3t^3#?

##### 1 Answer

If we restrict ourselves to real coefficients, the only linear factor is

Let's try multiplying it out:

Comparing the coefficients with the original polynomial, we get:

Hence

So

May 9, 2015

If we restrict ourselves to real coefficients, the only linear factor is

Let's try multiplying it out:

Comparing the coefficients with the original polynomial, we get:

Hence

So