Number system and number property

Explanation / Important formulas:

  • (a + b)(a – b) = (a2 – b2)
  • (a + b)2 = (a2 + b2 + 2ab)
  • (a – b)2 = (a2 + b2 – 2ab)
  • (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca)
  • (a3 + b3) = (a + b)(a2 – ab + b2)
  • (a3 – b3) = (a – b)(a2 + ab + b2)
  • (a3 + b3 + c3 – 3abc) = (a + b + c)(a2 + b2 + c2 – ab – bc – ac)
  • When a + b + c = 0, then a3 + b3 + c3 = 3abc

For more information: https://en.wikipedia.org/wiki/Number

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Number system and number property - Test



Number system and number property - Question and Answers

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