Question

square root -100 x square root -81

Answer 1

\[\sqrt{100}=10\]
\[\sqrt{81}=9\]
10*9=90

Answer 2

but doesn't the negative sign affect the answer?

Answer 3

well then there wasn't an answer because you can't square root negatives

Answer 4

I don't think you can sqrt negative even numbers, unless you are going into the imaginary number realm? i?

Answer 5

yeah well would it be 90i ?

Answer 6

\[\Large \sqrt{-100}\times\sqrt{-81}\]


\[\Large \sqrt{-1*100}\times\sqrt{-1*81}\]


\[\Large \sqrt{-1}\times\sqrt{100}\times\sqrt{-1}\times\sqrt{81}\]


\[\Large i\times10\times i\times9\]


\[\Large 90i^2\]


\[\Large 90(-1)\]


\[\Large -90\]


So \[\Large \sqrt{-100}\times\sqrt{-81}=-90\]

Answer 7

Thank you!