Expand.(5x + 3)4
A. 1875x4 + 4500 x3 + 1350x2 + 1620x + 81
B. 625x4 + 1500x3 + 1350x2 + 540x + 81
C. 625x3 + 1500x2 + 1350x + 540
D. (25x2 + 15x + 9)4
Answer: B
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