Use a Graphing Calculator to Approximate the Real Zeros $$f ( x ) = x ^ { 4 } - 9 x ^ { 2 } + 20$$

question 194

Multiple Choice

Use a graphing calculator to approximate the real zeros. Give each zero as a decimal to the nearest tenth.
- $$f ( x ) = x ^ { 4 } - 9 x ^ { 2 } + 20$$

• A) \(- 1,2.7,2.7 , - 2.7\)
• B) \(2.2 , - 2.2,2 , - 2\)
• C) \(2.2,2\)
• D) \(5 , - 5,4 , - 4\)

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