Solved

Solve by Completing the Square $z ^ { 2 } + 8 z - 5 = 0$

Question 56

Multiple Choice

Solve by completing the square.
- $z ^ { 2 } + 8 z - 5 = 0$

A) $- 4 \pm 2 \sqrt { 21 }$
B) $- 1 \pm \sqrt { 21 }$
C) $4 + \sqrt { 21 }$
D) $- 4 \pm \sqrt { 21 }$

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