Express as a polynomial.
A) 81x 4 + 198x 2 y 2 + 121y 4
B) 121x 4 - 198x 2 y 2 + 81y 4
C) 121x 4 + 99x 2 y 2 + 81y 4
D) 81x 2 + 198x 4 y 4 + 121y 2
E) 81x 4 + 99x 2 y 2 + 121y 4
Correct Answer:
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