Simplify the root, if possible.
A. (3m + 5n)2
B. cannot be simplified
C. 
D. 3m + 5n
Answer: B
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A. f(x) = (x + i)(x - i)(x + 15i)(x - 15i) B. f(x) = (x + 3i)(x - 3i)(x + 5i)(x - 5i) C. f(x) = (x + 3i)2(x + 5i)2 D. f(x) = (x + 3 + 5i)2(x + 3 - 5i)2