Answer:
3( n + )² - = 0
Explanation:
3n² = 6 - 17n ⇔ 3n² + 17n - 6 = 0
3( n² + 2 × n + ( )² - ( )² - 2 ) = 0
3( n + )² - 3 × - 6 = 0
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)² - 
= 0 n + ( )² - ( )² - 2 ) = 0 )² - 3 × 
- 6 = 0 )² - = 0