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What's an Excluded Value?

Definition: Excluded Value

Summary

  1. It is called 'excluded value' because we are not allowed to make any denominator 0
  2. Set the denominator of this rational expression equal to 0
  3. Solve for 'x' in the denominator by factoring the polynomial
  4. The excluded values are x = -2 and x = 2

Notes

    1. It is called 'excluded value' because we are not allowed to make any denominator 0
    1. Dividing by 0 is 'undefined'
    1. x2-4 = 0
    1. By setting (x+2) and (x-2) to 0 we can solve each one for 'x'
    2. We should find two excluded values this way
    1. These are our excluded values for our rational expression
    1. Remember that we can't make a denominator equal to 0