Perform the indicated operations and write the result in standard form.
-$\sqrt { - 49 } + \sqrt { - 81 }$
A) $- 16$
B) $16 \mathrm { i }$
C) $- 16 \mathrm { i }$
D) $63 \mathrm { i }$

Question

Quizplus · Accepted Answer

The square root of a negative number involves the imaginary unit $i$, where $i = \sqrt{-1}$. Thus, $\sqrt{-49} = 7i$ and $\sqrt{-81} = 9i$. Adding these gives $7i + 9i = 16i$.

Perform the Indicated Operations and Write the Result in Standard −49+−81\sqrt { - 49 } + \sqrt { - 81 }−49​+−81​

Perform the Indicated Operations and Write the Result in Standard $\sqrt { - 49 } + \sqrt { - 81 }$