Another GRE question

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I'm comparing Quantity A and Quantity B.

Column A
$15^{15} - 15^{14}$

Column B $15^{14}(14) - 1$

Since the 5 rules of exponents cant be applied, the book is asking me to factor quantity A and for the life of me, I dont understand. The book says quantity A, after factoring, should be $15^{15} - 15^{14} = 15^{14}(15-1)$. All the factoring examples have x's and y's so I'm having trouble finding where to start with this problem. Any tips?