Express $\displaystyle \sqrt{{-{7}}}$ as a complex number (in terms of i).

Write your answer in exact form.
$\displaystyle \sqrt{{-{7}}}$ = Preview Question 6 Part 1 of 2  
You can use the mathquill feature to enter a square root, or type "sqrt".
For example, sqrt(23) = $\displaystyle \sqrt{{{23}}}$.


Write your answer in approximate (decimal) form, rounded to the nearest thousandth.
$\displaystyle \sqrt{{-{7}}}$ = Preview Question 6 Part 2 of 2