INSTRUCTORSCarleen EatonGrant Fraser

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Solving Absolute Value Equations

  • The absolute value of a number is its distance from 0.
  • The absolute value of x is equal to x if x is greater than or equal to 0; otherwise, it is equal to –x.
  • Use this definition of absolute value to solve equations involving absolute values. Split the original equation |x| = a into two different possibilities, or cases, based on the definition: x = a and x = −a. Solve each one and combine the solutions.
  • Some equations have no solutions.
  • Always check all of the solutions. Some may not satisfy the original equation and must be discarded.

Solving Absolute Value Equations

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Mathematics: Algebra 2