Add the Polynomials $$\left( 3 y ^ { 2 n } + 5 y ^ { n } + 4 \right) + \left( 5 y ^ { 2 n } + 5 y ^ { n } + 8 \right)$$

Add the polynomials. Assume all variable exponents represent whole numbers.
- $$\left( 3 y ^ { 2 n } + 5 y ^ { n } + 4 \right) + \left( 5 y ^ { 2 n } + 5 y ^ { n } + 8 \right)$$

A) $8 y ^ { 4 n } + 10 y ^ { 2 n } + 12$
B) $9 y ^ { 2 n } + 8 y ^ { n } + 13$
C) $30 y ^ { 3 n }$
D) $8 y ^ { 2 n } + 10 y ^ { n } + 12$

Correct Answer:

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