Multiply. Assume that all variables represent natural numbers.(xa + 9)(x2a + 7)

A. x3a + 16xa + 63
B. x3a + 16x2a + 63
C. x3a + 9x2a + 7xa + 63
D. x2a2 + 9x2a + 7xa + 63


Answer: C

Mathematics

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