Question

Evaluate x + sq root(yz) when x = 3, y = 2, and z = –8.

7i
3 + 4i
3 - 16i
3 + 16i

Answer 1

Just remember  $\sqrt{-1} = i$

Sub in the numbers:
$3 + \sqrt{-16} = 3+ \sqrt{16}\sqrt{-1} = 3 + 4i$