Question

multiply:
(4√3 - 8√2)(3√3 + 6√2) = -60 my answer

Answer 1

Good, that's what I got as well.

Answer 2

do the middle terms add to zero?

Answer 3

for verification, you can type in (4*sqrt(3)-8*sqrt(2))(3*sqrt(3)+6*sqrt(2)) into google (which acts like a simple calculator)

http://www.google.com/search?hl=&q=%284*sqrt%283%29-8*sqrt%282%29%29%283*sqrt%283%29%2B6*sqrt%282%29%29

Answer 4

oh i guess they do. i am a lots slower