1. Find the value of \(m\), so that  \(2x -1\)  be a factor of \(40x^4 +20 x^3 - 80x^2 + 50x +5 m\).
 
\(m=\)
 
2. If \(x +1\) is a factor of \(ax^3 +x^2 -2x+4a-9\), then find the value of \(a\).
 
\(a=\)