Multiply the Conjugates $$( 9 + \sqrt { 5 } ) ( 9 - \sqrt { 5 } )$$

question 229

Multiple Choice

Multiply the conjugates.
- $$( 9 + \sqrt { 5 } ) ( 9 - \sqrt { 5 } )$$

• A) \(86 - 18 \sqrt { 5 }\)
• B) \(86 + 18 \sqrt { 5 }\)
• C) 86
• D) 76

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