I'm not too bright with maths, i wud be really grateful if i could get help with my queries. 1. How to solve (find roots) of cubic equations (ax^3+bx^2+cx+d=0) ? If possible please explain the the whole process without short-cuts. 2. Please explain Rank of a Matrix & how to determine them. For now i will end my queries here, however i have other queries which i wish to ask later. Thank you all in advance.