Question 432345
{{{(4sqrt(6) - 8sqrt(2))(5sqrt(6) + 10sqrt(2))
=4*5(sqrt(6) - 2sqrt(2))(sqrt(6) + 2sqrt(2))
=20((sqrt(6))^2 - (2sqrt(2))^2)

=20(6 - 4*2) = 20*-2 = -40

}}}