How do you factor #8a^3+27(x+y)^3#?
2 Answers
The answer is:
If you write:
This is a sum of two cubic, and you can use this rule:
So:
Temporarily simplify be replacing
and
So
becomes
which has factors
Restoring the original values, this becomes
It might be tempting to attempt to further factor the right-most term but a quick check using the formula for roots
[be careful not to confuse the