What are the restrications of the domain of the…

Discussion in 'Mathematics' started by Gherytru, Jul 7, 2017.

  1. Gherytru

    Gherytru New Member

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    What are the restrications of the domain of the function f (x)=1/x^2-9
     
  2. Antartis

    Antartis New Member

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    Only possible values we need to exclude are values that would give us 'number' with zero in denominator. So set x²-9 (assume x²-9 is denominator) equal to 0. X² — 9=0From here, solve for x; x²=9 x=±√9 x=±3So we cannot have -3 and 3 being in our domain. So restrictions of domain is x ≠ -3 and x ≠ 3.
     

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