When multiplying and dividing expressions involving exponents, you must have a common base. The following are examples of exponents that share a common base:
44 • 49andxy22 • xy15
The following examples of exponents do not share a common base:
4n3 • 4o3andx3 • xy15
In the last example, n and o are not common or the same and x and xy 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.
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