Simplify the polynomial by adding or subtracting, as indicated. Express your answer as a single polynomial in standard form.(9x4 + 3xy - y3) - (x4 + 6xy + 3y3)

A. 9x4 - 3xy - 4y3
B. 8x4 - 3xy - 2y3
C. 8x4 - 3xy - 4y3
D. 10x4 + 13xy + 2y3

Answer: C

Mathematics

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