# Math Help - Factorise

1. ## Factorise

How do you factorise the following:
r^3-6r^2+32

Thanks

2. Okay, here's a Hint:

$r^3-6r^2+32=r^3+(2r^2-8r^2)+(16r-16r)+32.$

3. I'm still confused. Is there a rule you can follow to get the correct answer? For all examples with x^3.

4. i think, this is an easier hint:

$r^3 + 2r^2 - 8r^2 +32$