Question

How do you multiply `-2sqrt10*sqrt8`?

Answer 1

`-2sqrt(10)*sqrt(8) = -2sqrt(10*8) = -2sqrt(80)`

`= -2sqrt(16*5) = -2sqrt(16)sqrt(5) = -2*4sqrt(5) = -8sqrt(5)`

...using `sqrt(a)*sqrt(b) = sqrt(a*b)`