Factorize:
 
1. \(lx+my+mx+ly\)
 
2. \(a^3x−x^4+a^2x^2−ax^3\)
Answer variants:
\((x+y)(m+l)\)
\((x+m)(y+l)\)
\((a+x)(ax−x)\)
\((a+x)(a^2x−x^3)\)