Using the Constant Multiple Rule for Simplifying a Series

The Constant Multiple Rule for integration allows you to simplify an integral by factoring out a constant. This option is also available when you’re working with series. Here’s the rule:

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For example:

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To see why this rule works, first expand the series so you can see what you’re working with:

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Working with the expanded form, you can factor a 7 from each term:

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Now express the contents of the parentheses in sigma notation:

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As if by magic, this procedure demonstrates that the two sigma expressions are equal. Of course, this magic is really nothing more exotic than your old friend from grade school, the distributive property.

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