Basic Algebra/Solving Equations/Formulas

From Wikibooks, open books for an open world
Jump to: navigation, search

Basic Formulas

  1. (a+b)^2=a^2+2ab+b^2
  2. (a-b)^2=a^2-2ab+b^2
  3. a^2+b^2=(a+b)^2 - 2ab
  4. a^2-b^2=(a+b)(a-b)
  5. (a+b)^3=a^3+3a^2b+3ab^2+b^3
  6. (a-b)^3=a^3-3a^2b+3ab^2-b^3
  7. a^3+b^3=(a+b)(a^2-ab+b^2)
  8. a^3-b^3=(a-b)(a^2+ab+b^2)