# #a + 2c + 3b = 0# then what is # a ^3 + 8 b ^3 + 27c^3#?

##### 1 Answer

Feb 18, 2015

We can rewrite one of the letters as an expression in the others.

Then we replace every

**Extra** :

**If** the first expression had been

*(and I suspect that it was!!)*

Then the

and, since

**Answer:**