Factor the expression. Express your answer so that only positive exponents occur. (x + 9)-3/13  + (x + 9)-1/13  + (x + 9) 1/13

A. (x + 9)-3/13 [1 + (x + 9) 2/13 + (x + 9)4/13]
B. (x + 9)-3/13 [1 + (x + 9) -2/13 + (x + 9) -4/13]
C. (x + 9)-3/13 [1 + (x + 9)1/13 + (x + 9)3/13]
D. (x + 9)-3/13 [1 + (x + 9)4/13 + (x + 9)6/13]


Answer: A

Mathematics

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