[tex]\huge\fcolorbox{lime}{white}{ANSWER : } \\ \\ - 54x {}^{7} y {}^{3} [/tex]
Step-by-step explanation:
[tex]2x {}^{4} \times ( - 3xy) {}^{3} \\ \\ 2x {}^{4} \times ( - (3xy) {}^{3} ) \\ \\ - 2x {}^{4} \times 27x {}^{3}y {}^{3} \\ \\ \large\red {{ - 54x {}^{7}y {}^{3} }}[/tex]