Factor completely. If the polynomial cannot be factored, write "prime."5x5 + 20x4 - 105x3

A. 5x3(x - 3)(x + 7)
B. x3(5x - 15)(x + 7)
C. 5x3(x2 + 4x - 21)
D. x3(x - 3)(5x + 35)


Answer: A

Mathematics

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