Find the Sum or Difference $$\left( 3 + 7 x ^ { 2 } + 9 x ^ { 4 } + 3 x ^ { 3 } \right) + \left( - 7 x ^ { 3 } - 9 x ^ { 2 } + 6 + 3 x ^ { 4 } \right)$$

question 422

Multiple Choice

Find the sum or difference.
- $$\left( 3 + 7 x ^ { 2 } + 9 x ^ { 4 } + 3 x ^ { 3 } \right) + \left( - 7 x ^ { 3 } - 9 x ^ { 2 } + 6 + 3 x ^ { 4 } \right)$$

• A) \(- 4 x ^ { 4 } - 4 x ^ { 3 } + 15 x ^ { 2 } + 6\)
• B) \(12 x ^ { 8 } - 4 x ^ { 6 } - 2 x ^ { 4 } + 9\)
• C) \(12 x ^ { 4 } - 4 x ^ { 3 } - 2 x ^ { 2 } + 9\)
• D) \(6 \mathrm { x } ^ { 18 } + 9\)

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