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Why are algebraic expressions called variables?

Updated: 8/20/2019
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11y ago

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Algebraic expressions may contain variables but they are not normally called variables. In fact, if they are related to identities, they need not be variable.

For example, (4x2 + 8xy + 4y2)/(x + y)2 is an algebraic expression, but it is not a variable: it equals 4.

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Q: Why are algebraic expressions called variables?
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