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

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Answer 1 · 2015-06-04T22:08:39

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

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

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

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