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Sticky Note
For which of the following expressions is b not a factor of ______?
  1. a³ + b³
  2. a² - b²
  3. a² + b²
  4. None of these
Explanation
a² + b² cannot be factored into terms that include b as a factor.
The other expressions (a³ + b³, a² - b², a⁴ + b⁴) can be factored in ways that include b as a factor.

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