Multiply Assume That All Variables Represent Natural Numbers $\left( x ^ { a } + 7 \right) \left( x ^ { 2 a } + 3 \right)$

question 39

Multiple Choice

Multiply. Assume that all variables represent natural numbers.
- $\left( x ^ { a } + 7 \right) \left( x ^ { 2 a } + 3 \right)$

• A) \(x ^ { 3 a } + 10 x ^ { a } + 21\)
• B) \(x ^ { 3 a } + 10 x ^ { 2 a } + 21\)
• C) \(x ^ { 3 a } + 7 x ^ { 2 a } + 3 x ^ { a } + 21\)
• D) \(x ^ { 2 a ^ { 2 } } + 7 x ^ { 2 a } + 3 x ^ { a } + 21\)

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