## COMMON BASEWhen multiplying and dividing expressions involving exponents, you must have a common base. The following are examples of exponents that share a common base:
xy^{22} • xy^{15}The following examples of exponents do not share a common base:
andx^{3} • xy^{15}In the last example, are not common or the same and o and x are not common or the same. When you have a common base, you may perform the mathematical operations, but when you do not have a common base, you may not perform the mathematical operations.xy |

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