4sqrt(16)-18sqrt(343)+90sqrt(243)-sqrt(196)
4*4 -18sqrt(343)+90sqrt(243)- 14
\(2 -18\sqrt{7^3}+90\sqrt{3^5}\\ 2 -18\sqrt{7^2}\sqrt7+90\sqrt{3^4}\sqrt3\\ 2 -18*7\sqrt7+90*9\sqrt3\\ 2 -126\sqrt7+810\sqrt3\\\)
