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8. What is the sum of (12m2 - 4n2) and (9m2 + 12n2)?
A. -21 m2 - 8n2 B. -21 m2 + 8n2
D. 21m2 + 8n2
C. 21m2 - 8n2​

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Answer:

D. 21m2 + 8n2

Step-by-step explanation:

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Answer:

D. 21m² + 8n²

Step-by-step explanation:

12m² + 9m² = 21m²

- 4n² + 12n² = 8n²

Sum = 21m² + 8n²

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