Question

1√-1×2√-2×3√-3×4√-4 by using complex numbers

Answer 1

Hope this is helpful to you...

Answer 2

you can write it this way
1×2×3×4×√1×√2×√3×√4× i×i×i×i

(also we i×i = -1 )
= 48√6

##hope it can help you ##