Add or Subtract $$12 \sqrt [ 3 ] { 3 } + 9 \sqrt [ 3 ] { 3 }$$

question 78

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $$12 \sqrt [ 3 ] { 3 } + 9 \sqrt [ 3 ] { 3 }$$

• A) \(21 \sqrt [ 3 ] { 6 }\)
• B) \(- 3 \sqrt [ 3 ] { 3 }\)
• C) \(21 \sqrt [ 3 ] { 3 }\)
• D) \(21 \sqrt [ 3 ] { 9 }\)

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