Izračunaj X: $$ {\left\lbrack \matrix{2 & 6 \cr 4 & 25 } \right\rbrack} * \left\lbrack \matrix{1 & 4 \cr 0 & 1} \right\rbrack = ? $$ $$\int_1^ 6 (x + 25 )^ 4 dx + 6 x = 0 $$