Perform the Operation and Simplify $- 3 a ^ { 2 } ( a + 1 ) + 7 a \left( a ^ { 2 } - 4 \right) - a ^ { 2 } ( a + 9 )$

question 97

Multiple Choice

Perform the operation and simplify. $- 3 a ^ { 2 } ( a + 1 ) + 7 a \left( a ^ { 2 } - 4 \right) - a ^ { 2 } ( a + 9 )$

• A) \(\quad 3 a ^ { 2 } + 12 a ^ { 4 } - 28\)
• B) \(\quad 3 a ^ { 3 } - 12 a ^ { 2 } - 28\)
• C) 0
• D) \(\quad 3 a ^ { 3 } - 12 a ^ { 2 } - 28 a\)

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