Important formulas used in mathematics for competitive exams

Important formulas used in mathematics for competitive exams: Here is a list of mathematical formulas which are very useful in various competitive exams like SSC, UPSC, IBPS, Railway Exams etc.

 
  1. (a + b)2 = a2 + 2ab + b2
  2. (a − b)2 = a2 − 2ab + b2
  3. a3 + b3 = (a + b)(a2 − ab + b2)
  4. a3 − b3 = (a − b)(a2 + ab + b2)
  5. a2 − b2 = (a + b)(a − b)
  6. (a + b)3 = a3 + b3 + 3ab(a + b)
  7. (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca)

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