a) (u - v + 3w)(2u + 5w)
b) (2x + y)(3x -2y)(x + 5y)
Hi brumby_3,
a) $\displaystyle (u-v+3w)(2u+5w)=$
$\displaystyle 2u(u-v+3w)+5w(u-v+3w)=$
$\displaystyle 2u^2-2uv+6uw+5uw-5vw+15w^2$
Just combine like terms and it's simplified.
b) $\displaystyle (2x+y)(3x-2y)(x+5y)=$
$\displaystyle (6x^2-xy-2y^2)(x+5y)=$
$\displaystyle x(6x^2-xy-2y^2)+5y(6x^2-xy-2y^2)=$
Now, just finish distributing, combine any like terms and it's simplified.