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-16 can be written as the product of 16 and -1, right? so what's the sqrt of 16 and the sqrt of -1?

i haven't any idea

|dw:1337100713360:dw|

ok, sqrt of 16, what multiplied with itself gives 16?

ok, what about -1?

im not sure about the -1

there isnt an answer for that... right?

|dw:1337100894030:dw|

ok, I'll give you that one, because it's a bit tricky, it's actually i. i * i = -1

i times i. got it.

ok, perfect, so sqrt of -16 = sqrt 16 * sqrt -1 = 4 * i

but its negative 16 under the square root....

and none of that is one of my choices

all of my choices look like fractions

|dw:1337101077852:dw|

so it would be

|dw:1337101138650:dw|

thank you so much for all of your help!

is this the answer?

in your choices?

its 16 + 28i over 65

perfect

|dw:1337101312782:dw|

yay!

|dw:1337101388901:dw|