Express as a polynomial.
A) 9x 4 + 21x 2 y 2 + 49y 4
B) 9x 4 + 42x 2 y 2 + 49y 4
C) 9x 2 + 42x 4 y 4 + 49y 2
D) 49x 4 + 21x 2 y 2 + 9y 4
E) 49x 4 - 42x 2 y 2 + 9y 4
Correct Answer:
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