Question 1092057
Use the distributive property and FOIL method,
{{{(3u-4v)^3=(3u-4v)(3u-4v)^2}}}
{{{(3u-4v)^3=(3u-4v)(9u^2-24uv+16v^2)}}}
{{{(3u-4v)^3=(3u)(9u^2-24uv+16v^2)-(4v)(9u^2-24uv+16v^2)}}}
{{{(3u-4v)^3=(27u^2-72u^2v+48uv^2)-(36u^2v-96uv^2+64v^3)}}}
Finish it from there.