Add or Subtract $\sqrt { 98 } - 3 \sqrt { 8 } + 9 \sqrt { 128 }$

question 157

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $\sqrt { 98 } - 3 \sqrt { 8 } + 9 \sqrt { 128 }$

• A) \(- 73 \sqrt { 2 }\)
• B) \(- 8 \sqrt { 2 }\)
• C) \(- 4 \sqrt { 2 }\)
• D) \(73 \sqrt { 2 }\)

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