Multiply (2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5))

(2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5))=2…
8(3-4*5)=8*(-17)=-136

(2sqrt(3)-4sqrt(5))(4sqrt(3)+8sqrt(5))
= 2(2sqrt(3)-4sqrt(5))(2sqrt(3)+4sqrt(5))
= 2[(2sqrt(3))^2 - (4sqrt(5))^2]
= 2(12 - 80)
= -136