To simplify the expression \(9a - 4a\), you can combine the like terms.
\[ 9a - 4a = (9 - 4)a = 5a \]
So, \(9a - 4a = 5a\).
To simplify the expression \(9a - 4a\), you can combine the like terms.
\[ 9a - 4a = (9 - 4)a = 5a \]
So, \(9a - 4a = 5a\).