Question

simplify the number using the imaginary unit i square root -28

Answer 1

i got \[-2\sqrt{-7}\]

Answer 2

\[i ^{2}=-1\]
so: (-1)(28)
\[i ^{?}\sqrt{28}\]
\[i^{2} \times \sqrt{4} \times \sqrt{7}\]
\[i ^{2} \times 2\sqrt{7}\]
\[-2\sqrt{7}\]

Answer 3

yeah you can't take the square root of a negative number

Answer 4

my options are \[2\sqrt{-7}\],\[-2\sqrt{-7}\], and \[2i \sqrt{7}\]

Answer 5

hmm then it's probably that last one

Answer 6

that's correct :3 thank you for your help

Answer 7

anytime