What is the completely factored form of d^4-81?
Am I correct?

Answer:
The answer to your question is: The second option is the correct one.
Step-by-step explanation:
You are wrong
d⁴ - 81
(d²)² - (3²)²
(d² - 3²)(d² + 3²)
(d - 3)(d + 3)(d² + 9)