To find the value of \( 4xm \) when \( m = 6 \), you need the value of \( x \). Without the value of \( x \), you cannot determine \( 4xm \).
If you have \( x \), you can plug the value of \( m \) into the expression:
\[ 4xm = 4x(6) = 24x \]
If you provide the value of \( x \), I can help you calculate \( 4xm \).