[Solved] Simplyfing a simple equation: (18 - 2a)^2
This is what I need to Simplify: (18 - 2a)²
The lecturer briefly mentioned that (18 - 2a)² = 18 x 2a², but I think he made an error? I don't know how he got to that answer. Substituting a value for "a" afterwards shows that it's wrong...