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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Definitions:

Perfectly Competitive

A market structure characterized by a large number of small firms, identical products, and free entry and exit, with no single seller or buyer having market control.

Many Buyers

A market condition characterized by the presence of numerous purchasers, increasing competition and potentially lowering prices.

Real Prices

Prices that have been adjusted for inflation, reflecting the true purchasing power of money over time.

CPI

The Consumer Price Index (CPI) measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.