Write the number in standard form a + bi.
-$\frac { 8 - \sqrt { - 20 } } { 2 }$
A) $4 - i \sqrt { 5 }$
B) $4 - i \sqrt { 10 }$
C) $4 + i \sqrt { 10 }$
D) $4 - 2 i \sqrt { 5 }$

Question

Quizplus · Accepted Answer

First, simplify the given expression: $\frac { 8 - \sqrt { - 20 } } { 2 } = 4 - \frac { \sqrt { - 20 } } { 2 }$. Since $\sqrt { - 20 } = \sqrt { 20 } \cdot i = 2\sqrt { 5 } \cdot i$, dividing by 2 gives $4 - \sqrt { 5 } \cdot i$, which matches choice A.

Write the Number in Standard Form a + Bi 8−−202\frac { 8 - \sqrt { - 20 } } { 2 }28−−20​​

Write the Number in Standard Form a + Bi $\frac { 8 - \sqrt { - 20 } } { 2 }$