Find the Sum or Difference $2 \left( - 2 r ^ { 4 } + 9 r ^ { 3 } - 3 r \right) - 3 \left( 8 r ^ { 4 } - 9 r ^ { 3 } + 6 r ^ { 2 } - 2 r \right)$

question 578

Multiple Choice

Find the sum or difference.
- $2 \left( - 2 r ^ { 4 } + 9 r ^ { 3 } - 3 r \right) - 3 \left( 8 r ^ { 4 } - 9 r ^ { 3 } + 6 r ^ { 2 } - 2 r \right)$

• A) \(- 28 r ^ { 4 } + 45 r ^ { 3 } - 18 r ^ { 2 }\)
• B) \(- 28 r ^ { 4 } - 9 r ^ { 3 } + 18 r ^ { 2 } - 12 r\)
• C) \(- 28 r ^ { 4 } + 6 r ^ { 2 } - 5 r\)
• D) \(- 28 r ^ { 4 } + 18 r ^ { 3 } - 6 r ^ { 2 } - r\)

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